如何动画UIButton背景颜色

Question

我想将UIButton背景颜色从黑色更改为白色。但我想在动画中改变它。例如......黑色＆gt;灰色＆gt;白色。在iPhone SDK中有没有简单的方法？谢谢。

Answer 1

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 300, 50)];
    [button setTitle:@"hi" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor blackColor]];
    [self.view addSubview:button];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2.5];
    button.backgroundColor = [UIColor whiteColor];
    [UIView commitAnimations];

Answer 2

属性backgroundColor自3.2 SDK以来是可动画的。