ios - UIView 组合不同时长的动画

Question

我想在我的 View 中设置 alpha 变化和帧变化的动画。要注意的是我希望 alpha 更改在帧更改之前结束。目前我正在做这样的事情来同时实现这两个目标:

UIView *someview = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
        [self.view addSubview:someview];
        someview.alpha = 0.0f;
        [UIView animateWithDuration:1 animations:^{
            self.view.alpha = 1.0f;
            self.view.frame = CGRectMake(200, 200, 100, 100);
        }];

Answer 1

我认为你应该替换这个:

[UIView animateWithDuration:1 animations:^{
    self.view.alpha = 1.0f;
    self.view.frame = CGRectMake(200, 200, 100, 100);
}];

到:

[UIView animateWithDuration:1 animations:^{
    self.view.alpha = 1.0f;
}];
[UIView animateWithDuration:1.4 animations:^{
    self.view.frame = CGRectMake(200, 200, 100, 100);
}];