iOS开发之旋转动画及GIF格式图片的播放

最新推荐文章于 2023-06-16 21:31:05 发布

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本文介绍如何使用Objective-C在iOS应用中实现图片旋转动画及GIF动画效果。通过UIImageView展示单张图片并设置动画属性，利用UIView动画方法实现平滑旋转效果；通过加载一系列图片到NSMutableArray中，设置UIImageView的animationImages属性播放GIF动画。

self.imageView = [[UIImageView alloc] initWithFrame:(CGRectMake(0, 0, 100, 100))];
self.imageView.image = [UIImage imageNamed:@"circle"];
[self.view addSubview:self.imageView];
[self startAnimation];

- (void)startAnimation
{
    // UIViewAnimationOptionCurveLinear匀速执行(默认就是它)
    [UIView animateWithDuration:0.01 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        self.imageView.transform = CGAffineTransformMakeRotation(i * M_PI / 180.f);
    } completion:^(BOOL finished) {
        i += 7; [self startAnimation];
    }];
}

把GIF图片里的每一帧复制出来，mac上直接全选，拖出来就行。拖出来是TIFF格式，没关系，一样用。

self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
NSMutableArray *image_arr = [NSMutableArray array];
for (int i = 1; i < 50; i++) {
    NSString *name = [NSString stringWithFormat:@"textGIF%d.tiff", i];
    UIImage *image = [[UIImage alloc] init];
    image = [UIImage imageNamed:name];
    [image_arr addObject:image];
    NSLog(@"image:%@", image);
}
NSLog(@"%@", self.imageView);
self.imageView.animationImages = image_arr;
self.imageView.animationDuration = 4;
self.imageView.animationRepeatCount = 100;
[self.imageView startAnimating];
[self.view addSubview:self.imageView];