动画UITextField以指示错误的密码 [英] animating UITextField to indicate a wrong password

问题描述

如何将动画添加到 UITextField ，以指示与Facebook应用程序（登录屏幕）或Mac OS X登录框中的密码完全相同的错误密码？

how can I add an animation to a UITextField to indicate wrong password exactly like the one in facebook app (at login screen) or the Mac OS X login box ?

提前谢谢你。

推荐答案

类似的东西

-(void)shake:(UIView *)theOneYouWannaShake
{
  [UIView animateWithDuration:0.03 animations:^
                                  {
                                    theOneYouWannaShake.transform = CGAffineTransformMakeTranslation(5*direction, 0);
                                  } 
                                  completion:^(BOOL finished) 
                                  {
                                    if(shakes >= 10)
                                    {
                                      theOneYouWannaShake.transform = CGAffineTransformIdentity;
                                      return;
                                    }
                                    shakes++;
                                    direction = direction * -1;
                                    [self shake:theOneYouWannaShake];
                                  }];
}

所以你还需要三件事：一个int方向，之前设置为1摇动被称为int shakes，在调用抖动之前设置为0，并且持续MAX_SHAKES，它是您想要的大小。希望有所帮助。

So you need three more things: An int direction which is set to 1 before the shake is called an int shakes, which is set to 0 before the shake is called and a constant MAX_SHAKES which is as large as you like. Hope that helps.

编辑：

这样称呼：

  direction = 1;
  shakes = 0;
  [self shake:aUIView];

头文件内添加

int direction;
int shakes;

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