IPHONE GIF 播放的方式

转 http://blog.csdn.net/zltianhen/article/details/6841466

１.UIWebView 播放（无法控制周期）

.h

 

@interface webViewController : UIViewController {
    IBOutlet UIWebView *WebView;
    IBOutlet UINavigationBar *Nav;
}
@property (nonatomic, retain) IBOutlet UIWebView *WebView;
@end

.m

 

 

- (void)viewDidLoad {
    [super viewDidLoad];
    [WebView setOpaque:NO];
    [WebView setBackgroundColor:[UIColor clearColor]];
    Nav.topItem.title=@"Welcome";
    Nav.topItem.leftBarButtonItem=nil;
    NSString* gifFileName = @"j_0002.gif";
    NSMutableString* htmlStr = [NSMutableString string];
    [htmlStr appendString:@"Hello Honey"];
    [htmlStr appendString:@"<p><img src=\""];
    [htmlStr appendFormat:@"%@",gifFileName];
    [htmlStr appendString:@"\" alt=\"picture\"/>"];
    [WebView loadHTMLString:htmlStr baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
}

2.glgif提供的开源代码实现（目前无法控制周期，需要自己再研究）

 

 

3.使用UIView的animation接口实现（GIF需要整理出每张图片）

动画可以用UIImageView，把动画的每一帧做成图片，转换成UIImage保存在animationImages数组中，调用- (void)startAnimating;就能看到动画

 

4.把GIF的通过GIF的格式转换成每张图片，通过UIView的animation的接口实现（GIF的格式貌似还是有问题，有部分图片的背景有问题）

 

- (NSMutableArray*)getImgArrayByName:(NSString*)name
{
    //happybaby20
    NSURL *threeUrl =[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"crad"
                                                                            ofType:@"gif"]];
    NSData* data = [[NSData alloc]initWithContentsOfURL:threeUrl];
    NSMutableArray* array = nil;
//  long word = ::SizeofResource(handle,hrsrc);
//  char* lpBy = (char*)LoadResource(handle,hrsrc);
    DWORD word = data.length;
    BYTE* lpBy = (BYTE*)data.bytes;
    //每张图保存的指针 需要释放
    BYTE* pByte[100] = {0};
    //每张图的大小
    DWORD nu[100] = {0};
    //图片数量
    int num = 0;
    DWORD firstLocation = 0;
    for(DWORD j=0;j<word;j++)
    {
        if(lpBy[j]==0x2c)
        {
            if(lpBy[j-1]==0x00)
            {
                if(num==0)
                {
                    firstLocation = j;
                }

                if (num== 10)
                {
                    int sdf=nu[num];
                    int sdfadf=0;
                }

                PGifImage nowImage = (PGifImage)&lpBy[j+1];

                if(nowImage->Flag.a==0)
                {
                    DWORD number = 1+sizeof(GifImage);
                    while(lpBy[j+number]!=0)
                    {
                        number = number+(DWORD)lpBy[j+number]+1;
                    }
                    number++;
                    pByte[num] = new BYTE[number];
                    memset(pByte[num],0,number);
                    for(DWORD n=0;n<number;n++)
                    {
                        *(BYTE*)(pByte[num]+n) = lpBy[j+n];
                    }
                    nu[num] = number;
                    j = j+number-1;
                    num++;
                }
                else
                {
                    //int number = 1+ sizeof(GifImage) + 3*(int)floor(pow(2.0f,nowImage->Flag.d));

                    DWORD number = 1+sizeof(GifImage)+1+3*(int)floor(pow(2.0f,nowImage->Flag.d));
                    while(lpBy[j+number] != 0)
                    {
                        number = number+lpBy[j+number];
                    }
                    pByte[num] = new BYTE[number];
                    memset(pByte[num],0,number);
                    for(int n=0;n<number;n++)
                    {
                        *(BYTE*)(pByte[num]+n) = lpBy[j+n];
                    }
                    nu[num] = number;
                    j = j+number-1;
                    num++;
                }


            }
        }
    }

    NSArray *userPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentDirectory = [userPaths objectAtIndex:0];

    //数量上
    if (num>0)
    {
        array = [[NSMutableArray alloc] initWithCapacity:num];
    }
    for (int k=0; k<num; k++)
    {
        for(DWORD n=0;n<nu[k];n++)
        {
            lpBy[firstLocation+n] = *(BYTE*)(pByte[k]+n);
        }

        NSData* imgbuf = [[NSData alloc] initWithBytes:lpBy length:nu[k] + firstLocation];

        if (imgbuf)
        {

            UIImage* img = [[UIImage alloc]initWithData:imgbuf];

            NSData* imgdd = UIImagePNGRepresentation(img);

            [imgdd writeToFile:[NSString stringWithFormat:@"%@/sdf%d.png",documentDirectory,k] atomically:NO];

            if (img)
            {
                [array addObject:img];
            }

            [img release];
        }
        [imgbuf release];

        delete pByte[k];
        pByte[k] = NULL;
    }

    return array;
}

5.QuartzCore播放 比较完美的方案

 

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

@interface GifView : UIView {
    CGImageSourceRef gif;
    NSDictionary *gifProperties;
    size_t index;
    size_t count;
    NSTimer *timer;
}
- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath;
@end

.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] retain];
        gif = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:_filePath], (CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.05 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 = (id)ref;
}
-(void)removeFromSuperview
{
    NSLog(@"removeFromSuperview");
    [timer invalidate];
    timer = nil;
    [super removeFromSuperview];
}
- (void)dealloc {
        NSLog(@"dealloc");
    CFRelease(gif);
    [gifProperties release];
    [super dealloc];
}


@end

DEMO

 

 

GifView *gifview = [[GifView alloc] initWithFrame:CGRectMake(0, 0, 200, 200) filePath:[[NSBundle mainBundle] pathForResource:@"test.gif" ofType:nil]];
    [self.view addSubview:gifview];