帶動畫的UIButton圖像按鈕

Question

我有一個白色圖像按鈕。當我點擊時，它應該通過從底部到頂部的動畫變成黃色按鈕圖像，如果我再次單擊黃色按鈕圖像，它必須從上到下進行動畫，並更改爲白色圖像按鈕圖像。

這是我的嘗試：

float originalY = btn.frame.origin.y; 
    float originalH = btn.bounds.size.height; 

    [UIView animateWithDuration:3.0f delay:1.0f  options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{ 

    btn.frame = CGRectMake(btn.frame.origin.x, (originalY + originalH), btn.bounds.size.width, 0); 

    [btn setBackgroundImage:[UIImage imageNamed:@"yellowimg.png"] forState:UIControlStateNormal]; 

    [btn setTitleColor:[[UIColor alloc]initWithRed:38.0/255.0 green:38.0/255.0 blue:38.0/255.0 alpha:1.0] forState:UIControlStateNormal]; 

    }  
    completion:^(BOOL finished) { 
     }]; 

Answer 1

btn.frame = CGRectMake(btn.frame.origin.x, (originalY + originalH), btn.bounds.size.width, 0); 

這種方法會讓你的按鈕，height = 0。 如果你想捲曲（翻轉）您的按鈕，並有「新」按鈕，從第一次出現，因爲我知道你應該使用類似的東西

[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:0.5]; 
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; 
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:firstView cache:YES]; 
[firstView addSubview:secondView]; 
[UIView commitAnimations];