应用程序从后台返回后，UIButton imageForState 不正确 [英] UIButton imageForState is not correct after the app returns from being in the background

问题描述

我在 .h 文件中声明了一个 UIButton

I have a UIButton declared in the .h file as

@property (retain, nonatomic) IBOutlet UIButton *btnQuarter;

当我有

if ([self.btnQuarter imageForState:UIControlStateNormal] == [UIImage imageNamed:@"match.png"])

应用一加载就完美运行.但是，当应用从锁定状态或在主屏幕上返回时，它不起作用.

as soon as the app loads it works perfectly. However when the app returns from being locked or being on the home screen it doesn't work.

推荐答案

试试这个代码:

 - (IBAction)nextQtr:(id)sender

   {
    if ([[sender imageForState:UIControlStateNormal] isEqual:[UIImage imageNamed:@"match.png"]])

   }

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