合成

//第一种

//图像目标

CGImageDestinationRef destination;

//创建输出路径

NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentStr = [document objectAtIndex:0];

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *textDirectory = [documentStr stringByAppendingPathComponent:@"gif"];

[fileManager createDirectoryAtPath:textDirectory withIntermediateDirectories:YES attributes:nil error:nil];

NSString *path = [textDirectory stringByAppendingPathComponent:@"test101.gif"];

//创建CFURL对象

/*

CFURLCreateWithFileSystemPath(CFAllocatorRef allocator, CFStringRef filePath, CFURLPathStyle pathStyle, Boolean isDirectory)

allocator : 分配器,通常使用kCFAllocatorDefault

filePath : 路径

pathStyle : 路径风格,我们就填写kCFURLPOSIXPathStyle 更多请打问号自己进去帮助看

isDirectory : 一个布尔值,用于指定是否filePath被当作一个目录路径解决时相对路径组件

*/

CFURLRef url = CFURLCreateWithFileSystemPath (

kCFAllocatorDefault,

(CFStringRef)path,

kCFURLPOSIXPathStyle,

false);

//通过一个url返回图像目标

destination = CGImageDestinationCreateWithURL(url, kUTTypeGIF, arr.count, NULL);

//设置gif信息

NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:4];

[dict setObject:[NSNumber numberWithBool:YES] forKey:(NSString*)kCGImagePropertyGIFHasGlobalColorMap];

[dict setObject:(NSString *)kCGImagePropertyColorModelRGB forKey:(NSString *)kCGImagePropertyColorModel];

[dict setObject:[NSNumber numberWithFloat:16] forKey:(NSString*)kCGImagePropertyDepth];

[dict setObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount];

NSDictionary *gifProperties = [NSDictionary dictionaryWithObject:dict

forKey:(NSString *)kCGImagePropertyGIFDictionary];

//设置gif的信息,播放间隔时间,基本数据,和delay时间

NSDictionary *frameProperties = [NSDictionary dictionaryWithObject:

[NSMutableDictionary dictionaryWithObjectsAndKeys:

[NSNumber numberWithFloat:0.45],

(NSString *)kCGImagePropertyGIFDelayTime, nil]

forKey:(NSString *)kCGImagePropertyGIFDictionary];

//合成gif

for (UIImage* dImg in arr)

{

CGImageDestinationAddImage(destination, dImg.CGImage, (__bridge CFDictionaryRef)frameProperties);

}

CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifProperties);

CGImageDestinationFinalize(destination);

//第二种

+(NSString *)exportGifImages:(NSArray*)images delays:(NSArray*)delays loopCount:(NSUInteger)loopCount 

{

NSString *fileName = [NSString stringWithFormat: @"%.0f.%@", [NSDate timeIntervalSinceReferenceDate] * 1000.0, @"gif"];

NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:fileName];

CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:filePath],

kUTTypeGIF, images.count, NULL);

if(!loopCount){

loopCount = 0;

}

NSDictionary *gifProperties = @{ (__bridge id)kCGImagePropertyGIFDictionary: @{

(__bridge id)kCGImagePropertyGIFLoopCount: @(loopCount), // 0 means loop forever

}

};

float delay = 0.1; //默认每一帧间隔0.1秒

for(int i= 0 ; i <images.count ;i ++){

UIImage *itemImage = images[i];

if(delays && i<delays.count){

delay = [delays[i] floatValue];

}

//每一帧对应的延迟时间

NSDictionary *frameProperties = @{(__bridge id)kCGImagePropertyGIFDictionary: @{

(__bridge id)kCGImagePropertyGIFDelayTime: @(delay), // a float (not double!) in seconds, rounded to centiseconds in the GIF data

}

};

CGImageDestinationAddImage(destination,itemImage.CGImage, (__bridge CFDictionaryRef)frameProperties);

}

CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifProperties);

if (!CGImageDestinationFinalize(destination)) {

NSLog(@"failed to finalize image destination");

}

CFRelease(destination);

return filePath;

}

展示的三种方式

//1. 第三方

// 网络图片

//  NSData *urlData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.chinagif.com/gif/part/boy/0045.gif"]];

// 本地图片

NSData *localData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"run" ofType:@"gif"]];

GifView *dataView = [[GifView alloc] initWithFrame:CGRectMake(0, 0, 100, 100) data:localData];

[self.view addSubview:dataView];

[dataView release];

// 或者

GifView *pathView =[[GifView alloc] initWithFrame:CGRectMake(100, 0, 100, 100) filePath:[[NSBundle mainBundle] pathForResource:@"run" ofType:@"gif"]];

[self.view addSubview:pathView];

[pathView release];

//2. webView

NSString *path = [[NSBundle mainBundle] pathForResource:@"run" ofType:@"gif"];

NSData *gifData = [NSData dataWithContentsOfFile:path];

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 120, 100, 100)];

webView.backgroundColor = [UIColor redColor];

webView.scalesPageToFit = YES;

[webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];

[self.view addSubview:webView];

[webView release];

//3. animationView

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];

[gifImageView release];