加载gif动态图的三种方式

准备：本地图片资源，GifView

GifView代码：

/**

 *  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;

#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];

}