iOS 加载gif动画

最新推荐文章于 2023-07-29 12:22:29 发布

LONG_IOS

最新推荐文章于 2023-07-29 12:22:29 发布

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分类专栏： IOS 高级篇文章标签： ios 动画 iOS动画 iOSgif

本文链接：https://blog.youkuaiyun.com/LONG_IOS/article/details/50717244

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这篇博客详细介绍了如何在iOS应用中实现GIF加载动画，提供了相关的代码示例，帮助开发者掌握这一技巧。

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iOS 加载gif动画相关代码如下

- (void)viewDidLoad {
    [super viewDidLoad];
    // 先引用ImageIO 获取gifSource    #import <ImageIO/ImageIO.h>
    NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"jiafei" withExtension:@"gif"];
    CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef)fileUrl, NULL);
    size_t imageCount = CGImageSourceGetCount(gifSource);
    NSMutableArray *images = [[NSMutableArray alloc] initWithCapacity:imageCount];
    NSMutableArray *times = [[NSMutableArray alloc] initWithCapacity:imageCount];
    NSMutableArray *keyTimes = [[NSMutableArray alloc] initWithCapacity:imageCount];
    
    float totalTime = 0;
    for (size_t i = 0; i < imageCount; i++) {
        CGImageRef cgimage= CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
        [images addObject:(__bridge id)cgimage];
        CGImageRelease(cgimage);
        
        NSDictionary *properties = (__bridge NSDictionary *)CGImageSourceCopyPropertiesAtIndex(gifSource, i, NULL);
        NSDictionary *gifProperties = [properties valueForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];
        NSString *gifDelayTime = [gifProperties valueForKey:(__bridge NSString* )kCGImagePropertyGIFDelayTime];
        [times addObject:gifDelayTime];
        totalTime += [gifDelayTime floatValue];
//      _size.width = [[properties valueForKey:(NSString*)kCGImagePropertyPixelWidth] floatValue];
//      _size.height = [[properties valueForKey:(NSString*)kCGImagePropertyPixelHeight] floatValue];
    }
    
    float currentTime = 0;
    for (size_t i = 0; i < times.count; i++) {
        float keyTime = currentTime / totalTime;
        [keyTimes addObject:[NSNumber numberWithFloat:keyTime]];
        currentTime += [[times objectAtIndex:i] floatValue];
    }
    
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
    [animation setValues:images];
    [animation setKeyTimes:keyTimes];
    animation.duration = totalTime;
    animation.repeatCount = HUGE_VALF;
    [self.view.layer addAnimation:animation forKey:@"gifAnimation"];
}