当点击切换不同状态时：
1.不用Bool值：
_collectBtn setBackgroundImage:[UIImage imageNamed:@"收藏按钮"] forState:UIControlStateNormal];
[_collectBtn setBackgroundImage:[UIImage imageNamed:@"已收藏"] forState:UIControlStateSelected];
点击方法写
sender.selected = !sender.selected;
if (sender.selected) {
}
else{
}
2.使用Bool值：
全局定义一个 Bool isRect；
if (isRect) {
isRect = NO;
[_loginview.rememberButton setImage:[UIImage imageNamed:@"记住密码未选中"] forState:UIControlStateNormal];
}
else{
isRect = YES;
[_loginview.rememberButton setImage:[UIImage imageNamed:@"记住密码"] forState:UIControlStateNormal];
}
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