加载gif动画的三种方式

GifView.h
/**
 *  调用结束就开始播放动画，如果需要用户指定何时播放的话，只需要把timer的开始放到合适的位置。通过对CFDictonaryRaf 也就是gifProperties的改变，我们还可以控制动画是否循环播放以及循环多少次停止。
 
    通过对index的改变也可以控制动画从某帧开始播放。同理，同时改变index和count的话，也可以控制从某帧到某帧的播放。
    注意：- (void)stopGif;之后才可以退出这个类。否则timer不会关闭，产生内存泄露。
 */

#import <UIKit/UIKit.h>
#import <ImageIO/ImageIO.h>

@interface GifView : UIView {
    CGImageSourceRef gif; // 保存gif动画
    NSDictionary *gifProperties;  // 保存gif动画属性
    size_t index;// gif动画播放开始的帧序号
    size_t count;// gif动画的总帧数
    NSTimer *timer;// 播放gif动画所使用的timer
}

- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath;
- (id)initWithFrame:(CGRect)frame data:(NSData *)_data;
- (void)stopGif;
GifView.m

#import "GifView.h"
#import <QuartzCore/QuartzCore.h>

@implementation GifView


- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath{
    
    self = [super initWithFrame:frame];
    if (self) {
        
        gifProperties = [NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary];
        gif = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:_filePath], (CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame data:(NSData *)_data{
    
    self = [super initWithFrame:frame];
    if (self) {
        
        gifProperties = [NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary];
        //        gif = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:_filePath], (CFDictionaryRef)gifProperties);
        gif = CGImageSourceCreateWithData((CFDataRef)_data, (CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

-(void)play
{
    index ++;
    index = index%count;
    CGImageRef ref = CGImageSourceCreateImageAtIndex(gif, index, (CFDictionaryRef)gifProperties);
    self.layer.contents = (__bridge id)ref;
    CFRelease(ref);
}
-(void)removeFromSuperview
{
    NSLog(@"removeFromSuperview");
    [timer invalidate];
    timer = nil;
    [super removeFromSuperview];
}
- (void)dealloc {
    NSLog(@"dealloc");
    CFRelease(gif);
}
- (void)stopGif
{
    [timer invalidate];
    timer = nil;
}

加载Gif的三种方式：（从网络或者本地）

- (NSData *)loadDataForIndex:(NSInteger)index {
    NSData *data = nil;
    if (index == 0) {
        //网络
        data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://s14.sinaimg.cn/mw690/005APVsyzy6MFOsVFfv5d&690"]];
    }else {
        //本地
        data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"run" ofType:@"gif"]];
    }
    return data;
}

1.GifView

    //第三方GifView(实现gif动画播放是通过将动画文件读取到CGImageSourceRef，然后用NSTimer来播放的。)
    
    //- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath;
    GifView *dataView = [[GifView alloc] initWithFrame:CGRectMake(0, 0, 100, 100) data:data];
    [self.view addSubview:dataView];
//    [dataView stopGif];

2.webView(不会出现内存问题)

    //webView
    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 120, 100, 100)];
    webView.backgroundColor = [UIColor redColor];
    webView.scalesPageToFit = YES;
    [webView loadData:data MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
    [self.view addSubview:webView];

3.帧动画

- (void)runGIFForImage {
    UIImageView *gifImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 240, 100, 100)];
    NSArray *gifArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"1"],
                         [UIImage imageNamed:@"2"],
                         [UIImage imageNamed:@"3"],
                         [UIImage imageNamed:@"4"],
                         [UIImage imageNamed:@"5"],
                         [UIImage imageNamed:@"6"],
                         [UIImage imageNamed:@"7"],
                         [UIImage imageNamed:@"8"],
                         [UIImage imageNamed:@"9"],
                         [UIImage imageNamed:@"10"],
                         [UIImage imageNamed:@"11"],
                         [UIImage imageNamed:@"12"],
                         [UIImage imageNamed:@"13"],
                         [UIImage imageNamed:@"14"],
                         [UIImage imageNamed:@"15"],
                         [UIImage imageNamed:@"16"],
                         [UIImage imageNamed:@"17"],
                         [UIImage imageNamed:@"18"],
                         [UIImage imageNamed:@"19"],
                         [UIImage imageNamed:@"20"],
                         [UIImage imageNamed:@"21"],
                         [UIImage imageNamed:@"22"],nil];
    gifImageView.animationImages = gifArray; //动画图片数组
    gifImageView.animationDuration = 5; //执行一次完整动画所需的时长
    gifImageView.animationRepeatCount = 999;  //动画重复次数
    [gifImageView startAnimating];
    [self.view addSubview:gifImageView];
}