iOS 播放Gif动画

// loadGifView.h

// PlayGif

// Created by 寒竹子 on 15/4/27.

#import <UIKit/UIKit.h>

@interface loadGifView : UIView

/**

* @brief 初始化

* @return

- (instancetype)initWithFrame:(CGRect)frame localFileURL:(NSURL *)fileURL;

/**

* @brief 开始gif动画

* @return

- (void)startGifAnimation;

/**

* @brief 停止gif动画

* @return

- (void)stopGifAnimation;

/**

* @brief 得到gif中所有的图片的frame

* @return

+ (NSArray *)getFramesFromGif:(NSURL *)fileURL;

@end

// loadGifView.m

// PlayGif

// Created by 寒竹子 on 15/4/27.

// 播放gif

#import "loadGifView.h"

#import <ImageIO/ImageIO.h>

#import <QuartzCore/CoreAnimation.h>

@interface loadGifView ()

@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 loadGifView

/**

* @brief 得到gif图片的信息

* @param

* @return

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];

}

CFRelease(CFBridgingRetain(dict));

}

if (gifSource) {

CFRelease(gifSource);

}

- (instancetype)initWithFrame:(CGRect)frame localFileURL:(NSURL *)fileURL

{

self = [super initWithFrame:frame];

if (self) {

_frames = [[NSMutableArray alloc] init];

_frameDelayTimes = [[NSMutableArray alloc] init];

_width = 0;

_height = 0;

if (fileURL) {

getFrameInfo((__bridge CFURLRef)fileURL, _frames, _frameDelayTimes, &_totalTime, &_width, &_height);

}

return self;

}

+ (NSArray *)getFramesFromGif:(NSURL *)fileURL

{

NSMutableArray *frames = [NSMutableArray arrayWithCapacity:3];

NSMutableArray *delays = [NSMutableArray arrayWithCapacity:3];

getFrameInfo((__bridge CFURLRef)fileURL, frames, delays, NULL, NULL, NULL);

return frames;

}

- (void)startGifAnimation

{

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];

NSMutableArray *times = [NSMutableArray arrayWithCapacity:3];

CGFloat currentTime = 0;

int count = (int)_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 = MAXFLOAT;

[self.layer addAnimation:animation forKey:@"gifAnimation"];

}

- (void)stopGifAnimation

{

[self.layer removeAllAnimations];

}

@end

// PlayGifViewController.h

// PlayGif

// Created by 寒竹子 on 15/4/27.

#import <UIKit/UIKit.h>

@interface PlayGifViewController : UIViewController

@end

// PlayGifViewController.m

// PlayGif

// Created by 寒竹子 on 15/4/27.

#import "PlayGifViewController.h"

#import "loadGifView.h"

@interface PlayGifViewController ()

@property (nonatomic, strong) NSArray * imageArr;

@end

@implementation PlayGifViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.view.backgroundColor = [UIColor blackColor];

// 播放gif动画

NSString * path = [[NSBundle mainBundle] pathForResource:@"2.gif" ofType:nil];

loadGifView * gifView = [[loadGifView alloc] initWithFrame:CGRectMake(([UIScreen mainScreen].bounds.size.width - 200) / 2.0f, 100, 200, 300) localFileURL:[NSURL fileURLWithPath:path]];

[gifView startGifAnimation];

[self.view addSubview:gifView];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

}

@end