ios - 如何在单击同一个 UIbutton 时更改 UIButton 背景图像？

Question

我使用UIButton与xib背景图像是check_box_off.png，同时点击atmbtn backgroundImage更改为check_box_on.png，同时NSLog打印yesString并再次单击atmbtn，backgroundImage相同check_box_on.png 同时 NSLog 只打印相同的 yesString .. 一次又一次地点击 atmbutton 只发生同样的情况..

- (IBAction)atmAction:(id)sender{  
    if( [atmbtn backgroundImageForState:UIControlStateNormal] ==
        [UIImage imageNamed:@"check_box_on.png"] ) {
       [atmbtn setImage:[UIImage imageNamed:@"check_box_off.png"] 
               forState:UIControlStateNormal]; 

        noString = @"No"; 
        NSLog(@"atm=%@",noString);
    } else if( [atmbtn backgroundImageForState:UIControlStateNormal] ==
                [UIImage imageNamed:@"check_box_off.png"]) {

        [atmbtn setImage:[UIImage imageNamed:@"check_box_on.png"]
                forState:UIControlStateNormal];

         yesString = @"Yes";
         NSLog(@"atm = %@",yesString);
     }
}

output:

NSLog Print:

atm=Yes

atm=Yes

atm=Yes

我该如何解决这个问题？请分享您的想法。

Answer 1

使用这个:

[atmbtn setBackgroundImage:[UIImage imageNamed:@"check_box_on.png"] forState:UIControlStateNormal];