这里记录下我实现在iOS端上进行Gif动画播放的代码。
调用代码:
@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];
}
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) NSMutableArray *frameDelayTimes;
@property (nonatomic , assign) CGFloat totalTime;
@property (nonatomic , assign) CGFloat width;
@property (nonatomic , assign) CGFloat height;
@end
@implementation QGifView
/*
* @brief resolving gif information
*/
void getFrameInfo(CFURLRef url, NSMutableArray *frames, NSMutableArray *delayTimes, CGFloat *totalTime,CGFloat *gifWidth, CGFloat *gifHeight)
{
CGImageSourceRef gifSource = CGImageSourceCreateWithURL(url, NULL);
// get frame count
size_t frameCount = CGImageSourceGetCount(gifSource);
for (size_t i = 0; i < frameCount; ++i) {
// get each frame
CGImageRef frame = CGImageSourceCreateImageAtIndex(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];
}
// kCGImagePropertyGIFDictionary中kCGImagePropertyGIFDelayTime,kCGImagePropertyGIFUnclampedDelayTime值是一样的
NSDictionary *gifDict = [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary];
[delayTimes addObject:[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime]];
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 animationWithKeyPath:@"contents"];
NSMutableArray *times = [NSMutableArray arrayWithCapacity: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 arrayWithCapacity:3];
for (int i = 0; i < count; ++i) {
[images addObject:[_frames objectAtIndex:i]];
}
[animation setValues:images];
[animation setTimingFunction:[CAMediaTimingFunction 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
代码下载:http://download.csdn.net/detail/qqmcy/8502055