IOS GIF and iosgif

IOS GIF and iosgif

Here we will record the code that enables GIF animation playback on iOS.

Call code:

@interface ViewController ()@property (nonatomic , strong) QGifView *gifView;@end@implementation ViewController- (void) viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];    [_gifView startGif];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"snow" withExtension:@"gif"];        _gifView = [[QGifView alloc] initWithCenter:CGPointMake(self.view.bounds.size.width / 2, 13) fileURL:fileUrl];        _gifView.backgroundColor = [UIColor clearColor];        _gifView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;            [self.view addSubview:_gifView];        UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];    btn.frame = CGRectMake(0, 0, 100, 60);    btn.center = CGPointMake(100, self.view.bounds.size.height - 50);    btn.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;    [btn setTitle:@"Start Gif" forState:UIControlStateNormal];    [btn addTarget:self action:@selector(startGif) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];            UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];    btn2.frame = CGRectMake(0, 0, 100, 60);    btn2.center = CGPointMake(220, self.view.bounds.size.height - 50);    btn2.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;    [btn2 setTitle:@"Stop Gif" forState:UIControlStateNormal];    [btn2 addTarget:self action:@selector(stopGif) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn2];    }- (void)startGif{    [_gifView startGif];}- (void)stopGif{    [_gifView stopGif];}

GIf playback View implementation

QGifView. h

#import <UIKit/UIKit.h>@interface QGifView : UIView- (id) initWithCenter:(CGPoint) center fileURL:(NSURL *)fileURL;- (void) startGif;- (void) stopGif;@end

QGifView. m

# Import "QGifView. h "# import <ImageIO/ImageIO. h> # import <QuartzCore/QuartzCore. h> @ interface QGifView () @ property (nonatomic, strong) NSMutableArray * frames; @ property (nonatomic, strong) limit * frameDelayTimes; @ property (nonatomic, assign) CGFloat totalTime; @ property (nonatomic, assign) CGFloat width; @ property (nonatomic, assign) CGFloat height; @ end @ implementation QGifView/** @ brief res Olving gif information */void getFrameInfo (CFURLRef url, comment * frames, comment * delayTimes, CGFloat * totalTime, CGFloat * gifWidth, CGFloat * gifHeight) {CGImageSourceRef gifSource = Response (url, NULL); // get frame count size_t frameCount = CGImageSourceGetCount (gifSource); for (size_t I = 0; I <frameCount; ++ I) {// get each frame CGImageRef frame = CGImageSourc ECreateImageAtIndex (gifSource, I, NULL); [frames addObject :( _ bridge id) frame]; CGImageRelease (frame ); // get gif info with each frame NSDictionary * dict = (NSDictionary *) CFBridgingRelease (CGImageSourceCopyPropertiesAtIndex (gifSource, I, NULL); NSLog (@ "kCGImagePropertyGIFDictionary % @", [dict valueForKey :( NSString *) kCGImagePropertyGIFDictionary]); // get gif size if (gifWidth! = NULL & gifHeight! = NULL) {* gifWidth = [[dict valueForKey :( NSString *) kCGImagePropertyPixelWidth] floatValue]; * gifHeight = [[dict valueForKey :( NSString *) kCGImagePropertyPixelHeight] floatValue];} // The region in the region. The region value is the same as NSDictionary * gifDict = [dict valueForKey :( NSString *) region]; [delayTimes addObject: [gifDict valueForKey :( NSString *) region]; if (totalTime) {* totalTime = * totalTime + [[gifDict valueForKey :( NSString *) kCGImagePropertyGIFDelayTime] floatValue] ;}}-(id) initWithCenter :( CGPoint) center fileURL :( NSURL *) fileURL {if (self = [super initWithFrame: CGRectZero]) {_ frames = [NSMutableArray array]; _ frameDelayTimes = [NSMutableArray array]; _ width = 0; _ height = 0; if (fileURL) {getFrameInfo (_ bridge CFURLRef) fileURL, _ frames, _ frameDelayTimes, & _ totalTime, & _ width, & _ height);} self. frame = CGRectMake (0, 0, _ width, _ height); self. center = center;} return self;}-(void) startGif {CAKeyframeAnimation * animation = [CAKeyframeAnimation usage: @ "contents"]; NSMutableArray * times = [NSMutableArray usage: 3]; CGFloat currentTime = 0; int count = _ frameDelayTimes. count; for (int I = 0; I <count; ++ I) {[times addObject: [NSNumber numberWithFloat :( currentTime/_ totalTime)]; currentTime + = [[_ frameDelayTimes objectAtIndex: I] floatValue];} [animation setKeyTimes: times]; NSMutableArray * images = [NSMutableArray Syntax: 3]; for (int I = 0; I <count; ++ I) {[images addObject: [_ frames objectAtIndex: I];} [animation setValues: images]; [animation setTimingFunction: [edicamatimingfunction functionWithName: kCAMediaTimingFunctionLinear]; animation. duration = _ totalTime; animation. delegate = self; animation. repeatCount = 50; [self. layer addAnimation: animation forKey: @ "gifAnimation"];}-(void) animationDidStop :( CAAnimation *) anim finished :( BOOL) flag {self. layer. contents = nil;}-(void) stopGif {[self. layer removeAllAnimations];} @ end

Code download: http://download.csdn.net/detail/qqmcy/8502055