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d27c8859c7
ASDisplayNodes now have an overidable method -placeholderImage that lets you provide a custom UIImage to display while a node is displaying asyncronously. The default implementation of this method returns nil and thus does nothing. A provided example project also demonstrates using the placeholder API.
106 lines
3.1 KiB
Objective-C
106 lines
3.1 KiB
Objective-C
/* This file provided by Facebook is for non-commercial testing and evaluation
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* purposes only. Facebook reserves all rights not expressly granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#import "ViewController.h"
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#import <AsyncDisplayKit/AsyncDisplayKit.h>
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#import "PostNode.h"
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#import "SlowpokeImageNode.h"
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#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
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@interface ViewController ()
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{
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PostNode *_postNode;
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SlowpokeImageNode *_imageNode;
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UIButton *_displayButton;
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}
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@end
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@implementation ViewController
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#pragma mark -
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#pragma mark UIViewController
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- (instancetype)init
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{
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if (!(self = [super init]))
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return nil;
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_displayButton = [UIButton buttonWithType:UIButtonTypeCustom];
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[_displayButton setTitle:@"Display me!" forState:UIControlStateNormal];
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[_displayButton addTarget:self action:@selector(onDisplayButton:) forControlEvents:UIControlEventTouchUpInside];
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UIColor *tintBlue = [UIColor colorWithRed:0 green:122/255.0 blue:1.0 alpha:1.0];
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[_displayButton setTitleColor:tintBlue forState:UIControlStateNormal];
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[_displayButton setTitleColor:[tintBlue colorWithAlphaComponent:0.5] forState:UIControlStateHighlighted];
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_displayButton.backgroundColor = [UIColor colorWithWhite:0.95 alpha:1.0];
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return self;
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}
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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[self.view addSubview:_displayButton];
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}
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- (void)viewWillLayoutSubviews
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{
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CGFloat padding = 20.0;
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CGRect bounds = self.view.bounds;
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CGFloat constrainedWidth = CGRectGetWidth(bounds);
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CGSize constrainedSize = CGSizeMake(constrainedWidth - 2 * padding, CGFLOAT_MAX);
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CGSize postSize = [_postNode measure:constrainedSize];
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CGSize imageSize = [_imageNode measure:constrainedSize];
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_imageNode.frame = (CGRect){padding, padding, imageSize};
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_postNode.frame = (CGRect){padding, CGRectGetMaxY(_imageNode.frame) + 10.0, postSize};
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CGFloat buttonHeight = 55.0;
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_displayButton.frame = (CGRect){0.0, CGRectGetHeight(bounds) - buttonHeight, CGRectGetWidth(bounds), buttonHeight};
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}
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// this method is pretty gross and just for demonstration :]
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- (void)createAndDisplayNodes
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{
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[_imageNode.view removeFromSuperview];
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[_postNode.view removeFromSuperview];
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// ASImageNode gets placeholders by default
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_imageNode = [[SlowpokeImageNode alloc] init];
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_imageNode.image = [UIImage imageNamed:@"logo"];
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_postNode = [[PostNode alloc] init];
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// change to NO to see text placeholders, change to YES to see the parent placeholder
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// this placeholder will cover all subnodes while they are displaying, just a like a stage curtain!
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_postNode.placeholderEnabled = NO;
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[self.view addSubview:_imageNode.view];
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[self.view addSubview:_postNode.view];
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}
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#pragma mark -
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#pragma mark Actions
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- (void)onDisplayButton:(id)sender
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{
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[self createAndDisplayNodes];
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}
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@end
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