載入gif動態圖的三種方式，gif動態三種方式

載入gif動態圖的三種方式，gif動態三種方式

準備：本地圖片資源，GifView

GifView代碼：

/** *  調用結束就開始播放動畫，如果需要使用者指定何時播放的話，只需要把timer的開始放到合適的位置。通過對CFDictonaryRaf 也就是gifProperties的改變，我們還可以控制動畫是否迴圈播放以及迴圈多少次停止。     通過對index的改變也可以控制動畫從某幀開始播放。同理，同時改變index和count的話，也可以控制從某幀到某幀的播放。    注意：- (void)stopGif;之後才可以退出這個類。否則timer不會關閉，產生記憶體泄露。 */#import <UIKit/UIKit.h>#import <ImageIO/ImageIO.h>@interface GifView : UIView {    CGImageSourceRef gif; // 儲存gif動畫    NSDictionary *gifProperties;  // 儲存gif動畫屬性    size_t index;// gif動畫播放開始的幀序號    size_t count;// gif動畫的總幀數    NSTimer *timer;// 播放gif動畫所使用的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;}

載入Gif的三種方式：（從網路或者本地）

- (NSData *)loadDataForIndex:(NSInteger)index {    NSData *data = nil;    if (index == 0) {        //網路        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(實現gif動畫播放是通過將動畫檔案讀取到CGImageSourceRef，然後用NSTimer來播放的。)        //- (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(不會出現記憶體問題)

    //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.幀動畫

- (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; //動畫圖片數組    gifImageView.animationDuration = 5; //執行一次完整動畫所需的時間長度    gifImageView.animationRepeatCount = 999;  //動畫重複次數    [gifImageView startAnimating];    [self.view addSubview:gifImageView];}