动画编程2－－使用动画进行视图过渡

1.实现转场效果

通过transitionWithView方法来实现视图的转场效果：

[UIView transitionWithView:_myView duration:2.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
        CGRect temp = _myView.frame;
        temp.origin.x += 100;
        _myView.frame = temp;
        [UIView transitionWithView:_mySecondView duration:1.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
            CGRect temp = _mySecondView.frame;
            temp.origin.x += 200;
            _mySecondView.frame = temp;
        } completion:nil];
    } completion:nil];

效果图：

2.从一个视图到另外一个视图：

 UIView *view = [[UIView alloc]initWithFrame:CGRectMake(50, 250, 150, 50)];
    view.layer.cornerRadius = 15;
    view.backgroundColor = [UIColor purpleColor];
    [UIView transitionFromView:_myView toView:view duration:2.0 options:UIViewAnimationOptionTransitionFlipFromTop completion:nil];

效果图：