IOS 8按钮背景图像检查不工作

Question

按钮背景图像检查在IOS 8中失败，它在IOS7及更早版本中正常工作。

-(void)buttonAction:(UIButon*)tempbutton
{
//working in IOS 7 but broken in IOS 8
if(tempbutton.currentBackgroundImage ==[UIImage imageNamed:@"uncheck.png"]){


}
}

Answer 1

尝试比较UIImage而不是backgroundImageForState: imageView属性返回的UIButton。

if ([[tempbutton backgroundImageForState:UIControlStateNormal] isEqual:[UIImage imageNamed@"uncheck.png"]]){
  // Button has a background image named 'uncheck.png'
} else{
  // Button has not a background image named 'uncheck.png'
}

检查是否选择了按钮的最佳方法是使用按钮的状态，例如UIButtonStateNormal或UIButtonStateSelected。你可以改变它的选择：

[tempbutton setSelected:![self.btnMenu isSelected]];

此外，如果以编程方式创建，请在xib或代码中按照按钮状态设置正确的图像：

[self.tempbutton setImage:[UIImage imageNamed:@"unselected"] forState:UIControlStateNormal];
[self.tempbutton setImage:[UIImage imageNamed:@"selected"] forState:UIControlStateSelected];