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Converted to a CocoaPod
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Brandon Withrow
313
Example/lottie-ios/AnimatedTextField.m
Normal file
313
Example/lottie-ios/AnimatedTextField.m
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//
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// LAAnimatedTextField.m
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// LottieExamples
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//
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// Created by Brandon Withrow on 1/10/17.
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// Copyright © 2017 Brandon Withrow. All rights reserved.
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//
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#import "AnimatedTextField.h"
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#import <lottie_ios/Lottie.h>
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@interface LACharacterCell : UICollectionViewCell
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- (void)setCharacter:(NSString *)character;
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- (void)displayCharacter:(BOOL)animated;
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- (void)loopAnimation;
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@end
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@implementation LACharacterCell {
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LAAnimationView *animationView_;
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NSString *character_;
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}
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- (void)prepareForReuse {
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[super prepareForReuse];
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}
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- (void)setCharacter:(NSString *)character {
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NSString *sanatizedCharacter = [character substringToIndex:1];
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NSCharacterSet *alphaSet = [NSCharacterSet letterCharacterSet];
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BOOL valid = [[sanatizedCharacter stringByTrimmingCharactersInSet:alphaSet] isEqualToString:@""];
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if ([character isEqualToString:@"BlinkingCursor"]) {
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sanatizedCharacter = character;
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}
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if ([sanatizedCharacter isEqualToString:@","]) {
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sanatizedCharacter = @"Comma";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:@"'"]) {
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sanatizedCharacter = @"Apostrophe";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:@":"]) {
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sanatizedCharacter = @"Colon";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:@"?"]) {
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sanatizedCharacter = @"QuestionMark";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:@"!"]) {
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sanatizedCharacter = @"ExclamationMark";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:@"."]) {
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sanatizedCharacter = @"Period";
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valid = YES;
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}
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if ([sanatizedCharacter isEqualToString:character_]) {
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return;
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}
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[animationView_ removeFromSuperview];
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animationView_ = nil;
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character_ = nil;
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if (!valid) {
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return;
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}
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character_ = sanatizedCharacter;
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LAAnimationView *animationView = [LAAnimationView animationNamed:sanatizedCharacter];
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animationView_ = animationView;
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animationView_.contentMode = UIViewContentModeScaleAspectFit;
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[self.contentView addSubview:animationView_];
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CGRect c = self.contentView.bounds;
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animationView_.frame = CGRectMake(-c.size.width, 0, c.size.width * 3, c.size.height);
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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CGRect c = self.contentView.bounds;
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animationView_.frame = CGRectMake(-c.size.width, 0, c.size.width * 3, c.size.height);
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}
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- (void)displayCharacter:(BOOL)animated {
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if (animated) {
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[animationView_ play];
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} else if (animationView_.animationProgress != 1) {
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[[NSOperationQueue mainQueue] addOperationWithBlock:^{
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animationView_.animationProgress = 1;
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}];
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}
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}
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- (void)loopAnimation {
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animationView_.loopAnimation = YES;
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}
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@end
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@interface AnimatedTextField () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
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@end
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@implementation AnimatedTextField {
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NSString *_text;
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UICollectionView *_collectionView;
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UICollectionViewFlowLayout *_layout;
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BOOL _updatingCells;
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NSArray *letterSizes_;
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}
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#pragma mark -- UIView
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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_layout = [[UICollectionViewFlowLayout alloc] init];
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_fontSize = 36;
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_collectionView = [[UICollectionView alloc] initWithFrame:self.bounds collectionViewLayout:_layout];
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[_collectionView registerClass:[LACharacterCell class] forCellWithReuseIdentifier:@"char"];
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_collectionView.delegate = self;
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_collectionView.dataSource = self;
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_collectionView.backgroundColor = [UIColor whiteColor];
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[self addSubview:_collectionView];
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}
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return self;
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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_collectionView.frame = self.bounds;
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}
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#pragma mark -- External
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- (void)setFontSize:(NSInteger)fontSize {
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_fontSize = fontSize;
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[self _computeLetterSizes];
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[_layout invalidateLayout];
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}
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- (void)scrollToBottom {
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CGPoint bottomOffset = CGPointMake(0, _collectionView.contentSize.height - _collectionView.bounds.size.height + _collectionView.contentInset.bottom);
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bottomOffset.y = MAX(bottomOffset.y, 0);
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[_collectionView setContentOffset:bottomOffset animated:YES];
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}
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- (void)setScrollInsets:(UIEdgeInsets)scrollInsets {
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[_collectionView setContentInset:scrollInsets];
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[self scrollToBottom];
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}
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- (void)setText:(NSString *)text {
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_text = text;
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[self _computeLetterSizes];
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[_collectionView reloadData];
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[self scrollToBottom];
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}
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- (void)changeCharactersInRange:(NSRange)range
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toString:(NSString *)replacementString {
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NSMutableString *newText = [_text mutableCopy];
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[newText replaceCharactersInRange:range withString:replacementString];
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NSMutableArray *updateIndices, *addIndices, *removeIndices;
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for (NSUInteger i = range.location; i < newText.length; i ++) {
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if (i < _text.length) {
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if (!updateIndices) {
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updateIndices = [NSMutableArray array];
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}
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[updateIndices addObject:[NSIndexPath indexPathForRow:i inSection:0]];
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} else {
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if (!addIndices) {
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addIndices = [NSMutableArray array];
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}
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[addIndices addObject:[NSIndexPath indexPathForRow:i inSection:0]];
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}
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}
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for (NSUInteger i = newText.length; i < _text.length; i ++) {
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if (!removeIndices) {
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removeIndices = [NSMutableArray array];
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}
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[removeIndices addObject:[NSIndexPath indexPathForRow:i inSection:0]];
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}
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_updatingCells = YES;
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_text = newText;
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[self _computeLetterSizes];
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[_collectionView performBatchUpdates:^{
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if (addIndices) {
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[_collectionView insertItemsAtIndexPaths:addIndices];
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}
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if (updateIndices) {
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[_collectionView reloadItemsAtIndexPaths:updateIndices];
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}
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if (removeIndices) {
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[_collectionView deleteItemsAtIndexPaths:removeIndices];
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}
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} completion:^(BOOL finished) {
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_updatingCells = NO;
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}];
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[self scrollToBottom];
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}
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#pragma mark -- Internal
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- (NSString*)_characterAtIndexPath:(NSIndexPath *)indexPath {
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return [_text substringWithRange:NSMakeRange(indexPath.row, 1)].uppercaseString;
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}
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- (void)_computeLetterSizes {
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NSMutableArray *sizes = [NSMutableArray array];
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CGFloat width = self.bounds.size.width;
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CGFloat currentWidth = 0;
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for (NSInteger i = 0; i < _text.length; i ++) {
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NSString *letter = [_text substringWithRange:NSMakeRange(i, 1)].uppercaseString;
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CGSize letterSize = [self _sizeOfString:letter];
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if ([letter isEqualToString:@" "] && i + 1 < _text.length) {
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NSString *cutString = [_text substringFromIndex:i + 1];
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NSArray *words = [cutString componentsSeparatedByString:@" "];
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if (words.count) {
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CGSize nextWordLength = [self _sizeOfString:words.firstObject];
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if (currentWidth + nextWordLength.width + letterSize.width > width) {
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letterSize.width = floorf(width - currentWidth);
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currentWidth = 0;
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} else {
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currentWidth += letterSize.width;
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}
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}
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} else {
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currentWidth += letterSize.width;
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if (currentWidth >= width) {
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currentWidth = letterSize.width;
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}
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}
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[sizes addObject:[NSValue valueWithCGSize:letterSize]];
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}
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CGSize cursorSize = [self _sizeOfString:@"W"];
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[sizes addObject:[NSValue valueWithCGSize:cursorSize]];
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letterSizes_ = sizes;
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}
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- (CGSize)_sizeOfString:(NSString *)string {
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CGSize constraint = CGSizeMake(1000, 1000);
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CGSize textSize = [string.uppercaseString boundingRectWithSize:constraint
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options:NSStringDrawingUsesLineFragmentOrigin
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attributes:@{ NSFontAttributeName : [UIFont boldSystemFontOfSize:self.fontSize] }
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context:nil].size;
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textSize.width += (string.length * 2);
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return textSize;
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}
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#pragma mark -- UICollevtionViewDataSource
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- (NSInteger)collectionView:(UICollectionView *)collectionView
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numberOfItemsInSection:(NSInteger)section {
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return _text.length + 1;
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}
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- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
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cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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LACharacterCell *charCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"char" forIndexPath:indexPath];
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return charCell;
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}
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- (void)collectionView:(UICollectionView *)collectionView
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willDisplayCell:(LACharacterCell *)cell
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forItemAtIndexPath:(NSIndexPath *)indexPath {
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if (indexPath.row < _text.length) {
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[cell setCharacter:[self _characterAtIndexPath:indexPath]];
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[cell displayCharacter:_updatingCells];
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} else {
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[cell setCharacter:@"BlinkingCursor"];
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[cell loopAnimation];
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[cell displayCharacter:YES];
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}
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}
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#pragma mark -- UICollevtionViewDelegate
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- (CGSize)collectionView:(UICollectionView *)collectionView
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layout:(UICollectionViewLayout*)collectionViewLayout
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sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
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NSValue *value = letterSizes_[indexPath.row];
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return value.CGSizeValue;
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}
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- (CGFloat)collectionView:(UICollectionView *)collectionView
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layout:(UICollectionViewLayout *)collectionViewLayout
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minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
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return 0;
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}
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- (CGFloat)collectionView:(UICollectionView *)collectionView
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layout:(UICollectionViewLayout *)collectionViewLayout
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minimumLineSpacingForSectionAtIndex:(NSInteger)section {
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return 0;
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}
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@end
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