objective-c - 我如何(如果可能)设置 CGAffineTransform 旋转的持续时间

Question

我的代码中有一个标准的 CGAffineTransformRotate 旋转 CALayer。我一直无法弄清楚如何设置动画的持续时间。

有什么想法吗？

谢谢大卫，多亏了你的评论，我才能找到我需要的东西。有时我觉得你只需要在盯着屏幕看 8 小时后有一个全新的视角，干杯。

jack

The developer doc. The answer is buried in here.

Answer 1

这段代码可能对你有帮助

// if you dont use this code with a UIButton cange the UIButton befor the "animateWithDuration:"

- (IBAction)rotate:(id)sender {

        [UIButton animateWithDuration:1.0 /* <---- duration of the animation (float)*/

                           animations:^{   /*block for animation*/

                               CGAffineTransform rotate = CGAffineTransformMakeRotation( 360 /* <---- Rotation degrees*/ / 180.0 * M_PI );
                               [button setTransform:rotate];

                             }
                         completion:^(BOOL finished){ /*code block triggerd when animation is done*/ }];

        // if here is an NSLog it wil probably be triggerd befor the animation ends

    }