ios/Timi/Class/Base/Category/UIImageView/UIImageView+Extension.m

//
//  UIImageView+Extension.m
//  Timi
//
//  Created by 翟玉磊 on 2021/5/18.
//

#import "UIImageView+Extension.h"

@implementation UIImageView (Extension)

- (void)loadGIFImageNamed:(NSString *)name {
    
    /// 找到GIF图片文件路径
    NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:name withExtension:@"gif"];

    /// 将GIF图片转换成对应的图片资源
    CGImageSourceRef imageSourceRef = CGImageSourceCreateWithURL((__bridge CFURLRef)fileUrl, NULL);
    
    /// 从图片资源中获取图片帧数，即由多少图片元素组成（注：GIF图片本质是有多张图片合成流动图片）
    size_t imageCount = CGImageSourceGetCount(imageSourceRef);

    /// 定义数组拆分图片源
    NSMutableArray *images = [NSMutableArray arrayWithCapacity:imageCount];

    /// 定义动画持续时长
    float animationDuration = 0.f;
    
    /// 循环获取图片元素
    for(size_t i = 0; i < imageCount; i++) {
        /// 从图片资源中取出图片元素，即每一帧的图片
        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(imageSourceRef, i ,NULL);
        ///图片转换
        UIImage *image = [UIImage imageWithCGImage:imageRef];
        ///存储图片
        [images addObject:image];
        ///获取元素图片的信息
        NSDictionary *imageElementInfo = (__bridge NSDictionary*)CGImageSourceCopyProperties(imageSourceRef,NULL);
        ///获取元素动画信息
        NSDictionary *imageElementGIFInfo = [imageElementInfo objectForKey:(__bridge NSString*)kCGImagePropertyGIFDictionary];
        /// 初始化每帧之间间隔的属性。
        CGFloat duration = 0.1f;
        NSNumber *unclampedDelayTime = [imageElementGIFInfo objectForKey:(__bridge NSString*)kCGImagePropertyGIFUnclampedDelayTime];

        if(unclampedDelayTime) {
            duration = unclampedDelayTime.floatValue;
        } else {
            NSNumber *delayTime = [imageElementGIFInfo objectForKey:(__bridge NSString*)kCGImagePropertyGIFDelayTime];
            if (delayTime) {
                duration = delayTime.floatValue;
            }
            
        }
        
        /// 获取延迟时间可能为0.f
        if(duration <= 0.011f) duration = 0.100f;
        animationDuration += duration;
        ///释放内存
        CGImageRelease(imageRef);
    }
    /// 图片控件载入动画图片数组
    self.animationImages = images;
    
    /// 设置动画持续时长
    self.animationDuration = animationDuration;

    /// 设置动画重复次数
    self.animationRepeatCount = 0;

    ///开启动画
    [self startAnimating];

}

@end