UIButton点击后改变背景的方法

初始设置： UIImage *bgImg1 = [UIImage imageNamed:@"Selected.png"];

UIImage *bgImg2 = [UIImage imageNamed:@"Unselected.png"];

[btn setImage:bgImg2 forState:UIControlStateNormal];

[btn setImage:bgImg1 forState:UIControlStateSelected];

然后在button的Action方法改变button状态：

- (IBAction) buttonTouch:(id)sender {

UIButton *button = (UIButton *)sender;

button.selected = !button.selected; }