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[AsyncDisplayKit+Utilities.h] Convenience methods for creating resizable circles & rounded rects. (#1811)

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* [AsyncDisplayKit+Utilities.h] UIImage category for performant (optionally rounded) flat color stretchable images

* treat clear background color as no background color (D99117)

* add borderWidth

* add several shorter methods per Scott's comment

* rename files and add to AsyncDisplayKit.h

* fix xcode project file

* update commentse
This commit is contained in:
Hannah Troisi
2016-07-04 16:34:16 -07:00
committed by appleguy
parent 3763df1f06
commit 682ddcfe51
4 changed files with 220 additions and 4 deletions
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10
AsyncDisplayKit/AsyncDisplayKit.h
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@@ -75,15 +75,17 @@
#import <AsyncDisplayKit/ASLog.h>
#import <AsyncDisplayKit/ASMutableAttributedStringBuilder.h>
#import <AsyncDisplayKit/ASThread.h>
#import <AsyncDisplayKit/CGRect+ASConvenience.h>
#import <AsyncDisplayKit/NSMutableAttributedString+TextKitAdditions.h>
#import <AsyncDisplayKit/UICollectionViewLayout+ASConvenience.h>
#import <AsyncDisplayKit/UIView+ASConvenience.h>
#import <AsyncDisplayKit/ASRunLoopQueue.h>
#import <AsyncDisplayKit/ASTextKitComponents.h>
#import <AsyncDisplayKit/ASTraitCollection.h>
#import <AsyncDisplayKit/ASVisibilityProtocols.h>
#import <AsyncDisplayKit/CGRect+ASConvenience.h>
#import <AsyncDisplayKit/NSMutableAttributedString+TextKitAdditions.h>
#import <AsyncDisplayKit/UICollectionViewLayout+ASConvenience.h>
#import <AsyncDisplayKit/UIView+ASConvenience.h>
#import <AsyncDisplayKit/UIImage+ASConvenience.h>
#import <AsyncDisplayKit/AsyncDisplayKit+Debug.h>
#import <AsyncDisplayKit/ASCollectionNode+Beta.h>

71
AsyncDisplayKit/UIImage+ASConvenience.h Normal file
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@@ -0,0 +1,71 @@
//
// UIImage+ASConvenience.h
// AsyncDisplayKit
//
// Created by Hannah Troisi on 6/24/16.
//
// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#import <UIKit/UIImage.h>
#import <UIKit/UIBezierPath.h>
// High-performance flat-colored, rounded-corner resizable images
//
// For "Baked-in Opaque" corners, set cornerColor equal to the color behind the rounded image object, e.g. the background color.
// For "Baked-in Alpha" corners, set cornerColor = [UIColor clearColor]
//
// See http://asyncdisplaykit.org/docs/corner-rounding.html for an explanation.
@interface UIImage (ASDKAdditions)
/**
* This generates a flat-color, rounded-corner resizeable image
*
* @param cornerRadius The radius of the rounded-corner
* @param cornerColor The fill color of the corners (For Alpha corners use clearColor)
* @param fillColor The fill color of the rounded-corner image
*/
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor;
/**
* This generates a flat-color, rounded-corner resizeable image with a border
*
* @param cornerRadius The radius of the rounded-corner
* @param cornerColor The fill color of the corners (For Alpha corners use clearColor)
* @param fillColor The fill color of the rounded-corner image
* @param borderColor The border color. Set to nil for no border.
* @param borderWidth The border width. Dummy value if borderColor = nil.
*/
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
borderColor:(UIColor *)borderColor
borderWidth:(CGFloat)borderWidth;
/**
* This generates a flat-color, rounded-corner resizeable image with a border
*
* @param cornerRadius The radius of the rounded-corner
* @param cornerColor The fill color of the corners (For Alpha corners use clearColor)
* @param fillColor The fill color of the rounded-corner image
* @param borderColor The border color. Set to nil for no border.
* @param borderWidth The border width. Dummy value if borderColor = nil.
* @param roundedCorners Select individual or multiple corners to round. Set to UIRectCornerAllCorners to round all 4 corners.
* @param scale The number of pixels per point. Provide 0.0 to use the screen scale.
*/
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
borderColor:(UIColor *)borderColor
borderWidth:(CGFloat)borderWidth
roundedCorners:(UIRectCorner)roundedCorners
scale:(CGFloat)scale;
@end

131
AsyncDisplayKit/UIImage+ASConvenience.m Normal file
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@@ -0,0 +1,131 @@
//
// UIImage+ASConvenience.m
// AsyncDisplayKit
//
// Created by Hannah Troisi on 6/24/16.
//
// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#import "UIImage+ASConvenience.h"
#import <UIKit/UIKit.h>
@implementation UIImage (ASDKAdditions)
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
{
return [self as_resizableRoundedImageWithCornerRadius:cornerRadius
cornerColor:cornerColor
fillColor:fillColor
borderColor:nil
borderWidth:1.0
roundedCorners:UIRectCornerAllCorners
scale:0.0];
}
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
borderColor:(UIColor *)borderColor
borderWidth:(CGFloat)borderWidth
{
return [self as_resizableRoundedImageWithCornerRadius:cornerRadius
cornerColor:cornerColor
fillColor:fillColor
borderColor:borderColor
borderWidth:borderWidth
roundedCorners:UIRectCornerAllCorners
scale:0.0];
}
+ (UIImage *)as_resizableRoundedImageWithCornerRadius:(CGFloat)cornerRadius
cornerColor:(UIColor *)cornerColor
fillColor:(UIColor *)fillColor
borderColor:(UIColor *)borderColor
borderWidth:(CGFloat)borderWidth
roundedCorners:(UIRectCorner)roundedCorners
scale:(CGFloat)scale
{
static NSCache *__pathCache = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
__pathCache = [[NSCache alloc] init];
// UIBezierPath objects are fairly small and these are equally sized. 20 should be plenty for many different parameters.
__pathCache.countLimit = 20;
});
// Treat clear background color as no background color
if ([cornerColor isEqual:[UIColor clearColor]]) {
cornerColor = nil;
}
CGFloat dimension = (cornerRadius * 2) + 1;
CGRect bounds = CGRectMake(0, 0, dimension, dimension);
// This is a hack to make one NSNumber key out of the corners and cornerRadius
if (roundedCorners == UIRectCornerAllCorners) {
// UIRectCornerAllCorners is ~0, but below is equivalent and we can pack it into half an NSUInteger
roundedCorners = UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomLeft | UIRectCornerBottomRight;
}
// Left half of NSUInteger is roundedCorners, right half is cornerRadius
UInt64 pathKeyNSUInteger = (UInt64)roundedCorners << sizeof(Float32) * 8;
Float32 floatCornerRadius = cornerRadius;
pathKeyNSUInteger |= (NSUInteger)floatCornerRadius;
NSNumber *pathKey = [NSNumber numberWithUnsignedLongLong:pathKeyNSUInteger];
UIBezierPath *path = nil;
CGSize cornerRadii = CGSizeMake(cornerRadius, cornerRadius);
@synchronized(__pathCache) {
path = [__pathCache objectForKey:pathKey];
if (!path) {
path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:roundedCorners cornerRadii:cornerRadii];
[__pathCache setObject:path forKey:pathKey];
}
}
// We should probably check if the background color has any alpha component but that
// might be expensive due to needing to check mulitple color spaces.
UIGraphicsBeginImageContextWithOptions(bounds.size, cornerColor != nil, scale);
if (cornerColor) {
[cornerColor setFill];
// Copy "blend" mode is extra fast because it disregards any value currently in the buffer and overwrites directly.
UIRectFillUsingBlendMode(bounds, kCGBlendModeCopy);
}
[fillColor setFill];
[path fill];
if (borderColor) {
[borderColor setStroke];
// Inset border fully inside filled path (not halfway on each side of path)
CGRect strokeRect = CGRectInset(bounds, borderWidth / 2.0, borderWidth / 2.0);
// It is rarer to have a stroke path, and our cache key only handles rounded rects for the exact-stretchable
// size calculated by cornerRadius, so we won't bother caching this path. Profiling validates this decision.
UIBezierPath *strokePath = [UIBezierPath bezierPathWithRoundedRect:strokeRect cornerRadius:cornerRadius];
[strokePath setLineWidth:borderWidth];
[strokePath stroke];
}
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIEdgeInsets capInsets = UIEdgeInsetsMake(cornerRadius, cornerRadius, cornerRadius, cornerRadius);
result = [result resizableImageWithCapInsets:capInsets resizingMode:UIImageResizingModeStretch];
return result;
}
@end