IOS for循环button点击其中一个button变色别的不

[button setTitleColor:__kColorBlack forState:UIControlStateNormal];

[button setTitleColor:__kColorRed forState:UIControlStateSelected];

[button addTarget:self action:@selector(acreageBtnClick:) forControlEvents:UIControlEventTouchUpInside];

self.acreageBtn = button;

//button点击方法

-(void)acreageBtnClick:(UIButton*)btn{

self.acreageBtn.selected = NO;

btn.selected = YES;

//注意self.acreageBtn.selected = NO和btn.selected = YES顺序不要放错了，否则点击最后一个按钮两次会出现问题，我也不知道为什么，哪位大神知道可以告诉我

self.acreageBtn = btn;

}