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];
