iOS bringSubviewToFront和exchangeSubviewAtIndex方法应用

联系人:石虎QQ: 1224614774  昵称:嗡嘛呢叭咪哄

-(void)viewWillAppear:(BOOL)animated {

[superviewWillAppear:animated];

self.view.backgroundColor= [UIColorwhiteColor];

#warning效果图一:

//懒加载，将切换城市按钮拿到最上层

[self.viewbringSubviewToFront:self.changeCityBtn];//将子视图在前面

#warning效果图二:

//用第二层子视图换第一层子视图的位置,self.view是第0层

//[self.view exchangeSubviewAtIndex:2 withSubviewAtIndex:1];

}

//changeCityBtngetter方法实现

-(UIButton*)changeCityBtn {

if(!_changeCityBtn) {

_changeCityBtn= [UIButtonbuttonWithType:UIButtonTypeCustom];

_changeCityBtn.frame=CGRectMake(kScreenWidth-44-10,20,44,44);

_changeCityBtn.imageEdgeInsets=UIEdgeInsetsMake(8,8,8,8);

[_changeCityBtnsetImage:[UIImageimageNamed:@"location_hardware"]forState:UIControlStateNormal];

[self.viewaddSubview:_changeCityBtn];

[_changeCityBtnaddTarget:selfaction:@selector(changeCity)forControlEvents:UIControlEventTouchUpInside];

}

return_changeCityBtn;

}