的UIButton：改變titleColor當點擊更改回來時otherButton點擊了

Question

我想A按鈕改變從白色到紅色的titleColor當我點擊

但是當我點擊另一個按鈕，我想A按鈕變回白色

我該怎麼做？

這是我寫的代碼，但它不工作，因爲我想。

[aButton setTitleColor:[UIColor redColor] forState:UIControlStateSelected]; 

Answer 1

使用setSelected:更改按鈕的選擇狀態。

在viewDidLoad中

：

[aButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 
[aButton setTitleColor:[UIColor redColor] forState:UIControlStateSelected]; 

[bButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 
[bButton setTitleColor:[UIColor redColor] forState:UIControlStateSelected]; 

aButton.selected = YES; 


- (IBAction)aButton_or_bButtonClicked:(id)sender { 

    if(aButton.selected) { 
     aButton.selected = NO; 
     bButton.selected = YES; 
    } 
    else { 
     aButton.selected = YES; 
     bButton.selected = NO; 
    } 
} 

Answer 2

應該像這樣：

- (IBAction)aButtonClicked:(id)sender { 
    [aButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; 
} 

- (IBAction)bButtonClicked:(id)sender { 
    [aButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 
}