Question

-(IBAction)duckAction:(id)sender{

    CABasicAnimation *moveDuck = [CABasicAnimation animationWithKeyPath:@"position"];
    [moveDuck setRemovedOnCompletion:YES];
    [moveDuck setDuration:.40];
    [moveDuck setRepeatCount:1];
    [moveDuck setAutoreverses:NO];
    [moveDuck setFromValue:[NSValue valueWithCGPoint:
                                 CGPointMake(btnDuck.center.x+25 ,btnDuck.center.y)]];
    [moveDuck setToValue:[NSValue valueWithCGPoint:
                               CGPointMake(btnDuck.center.x -25, btnDuck.center.y)]];
    [btnDuck.layer addAnimation:moveDuck forKey:@"position"];

}

-(IBAction)frogAction:(id)sender{
    ptFrog = btnFrog.center;

    [UIView animateWithDuration:1.00
                          delay:0.0
                        options:(UIViewAnimationOptionAutoreverse|UIViewAnimationOptionAllowUserInteraction)
                     animations:^ {
                         CGPoint position;
                         position.y = 577.0f;
                         position.x = 58.0f;
                         btnFrog.center = position;
                     }
                     completion:^(BOOL finished){
                         btnFrog.center = ptFrog;

                     }];
}

我有两个相互靠近的按钮。首先我按下青蛙按钮然后我在青蛙动画结束时按下鸭子按钮，青蛙按钮闪烁。我不知道为什么会这样？如何删除闪烁？

Answer 1

在完成块dude中删除此行。

 btnFrog.center = ptFrog;

动画完成后立即将其置于中心位置。这就是闪烁的原因。如果要设置中心，请将上面的代码放在动画块中

更新

-(IBAction)frogAction:(id)sender{
    ptFrog = btnFrog.center;

    [UIView animateWithDuration:1.00
                          delay:0.0
                        options:(UIViewAnimationOptionAutoreverse|UIViewAnimationOptionAllowUserInteraction)
                     animations:^ {
                         CGPoint position;
                         position.y = 577.0f;
                         position.x = 58.0f;
                         //btnFrog.center = position;

                         btnFrog.center = ptFrog;

                     }
                     completion:^(BOOL finished){

                     }];
}

动画中不需要的闪烁

1 个答案: