本文介绍了一个使用Objective-C实现的图片视图渐显和渐隐效果的方法。通过调整图片视图的透明度和缩放比例，在两秒内完成从不可见至可见状态的平滑过渡，反之亦然。
渐渐 出现
self.photoView = [[PhotoShowView alloc]initWithFrame:PJ_MainScreen];
self.photoView.transform = CGAffineTransformMakeScale(0.1, 0.1);
self.photoView.alpha = 0;
self.photoView.backgroundColor = [UIColor whiteColor];
[self.view addSubview:self.photoView];
[UIView animateWithDuration:2 animations:^{
self.photoView.transform = CGAffineTransformMakeScale(1, 1);
self.photoView.alpha = 1;
} completion:^(BOOL finished) {
}];
self.transform = CGAffineTransformMakeScale(1, 1);
self.alpha = 1;
[UIView animateWithDuration:2 animations:^{
self.transform = CGAffineTransformMakeScale(0.1, 0.1);
self.alpha = 0;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
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