UIImage

+ (nullable UIImage *)imageNamed:(NSString *)name;

根据name生成图片
系统有缓存,程序员无法回收

+ (nullable UIImage *)imageWithContentsOfFile:(NSString *)path;

根据路径加载图片
只要没有强引用,就会回收,传入全路径,不能加载Assets里面的图片

+ (nullable UIImage *)animatedImageWithImages:(NSArray<UIImage *> *)images duration:(NSTimeInterval)duration NS_AVAILABLE_IOS(5_0);

根据数组和持续时间生成动画图片
images:动画图片数组
duration:动画持续时间

案例(动画图片)

- (void)setupUI {
    //创建图片数组
    NSMutableArray *arrayM = [NSMutableArray array];
    
    for (int i = 1; i <= 25; i++) {
        //图片名称
        NSString *imageName = [NSString stringWithFormat:@"father%03d",i];
        //创建UIImage
        UIImage *image = [UIImage imageNamed:imageName];
        //添加到数组
        [arrayM addObject:image];
    }
    //参数1:要动画的图片数组
    //参数2:动画持续时间
    UIImage *img = [UIImage animatedImageWithImages:arrayM duration:2];
    
    //创建UIImageView
    UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 150)];
    //设置位置
    iv.center = self.view.center;
    //设置图片
    iv.image = img;
    //添加到父容器
    [self.view addSubview:iv];
    
}