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-(void)viewWillAppear:(BOOL)animated {

[superviewWillAppear:animated];

self.view.backgroundColor= [UIColorwhiteColor];

#warning效果圖一:

//懶加載，將切換城市按鈕拿到最上層

[self.viewbringSubviewToFront:self.changeCityBtn];//將子視圖在前面

#warning效果圖二:

//用第二層子視圖換第一層子視圖的位置,self.view是第0層

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

}

//changeCityBtngetter方法實現

-(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;

}