嘗試添加爲子視圖時，ScrollView無法正常工作

Question

我的scrollView出現問題！我有一個名爲Rootview的視圖，我想爲scrollview添加三個子視圖。當我將scrollview作爲子視圖添加時，中間視圖和三個子視圖消失。這是我的代碼.. Rootview（整個窗口）和scrollview是網點。

UIView *middleView = [[UIView alloc] initWithFrame:CGRectMake(0, 218, 2024, 218)]; 
[middleView setBackgroundColor: [UIColor yellowColor]]; 
[RootView addSubview:middleView]; 

//create new views for sap systems beginning from left 

UIView *firstSystem1 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 218)]; 
[firstSystem1 setBackgroundColor: [UIColor grayColor]]; 
[middleView addSubview:firstSystem1]; 

UIView *secondSystem1 = [[UIView alloc] initWithFrame:CGRectMake(305, 0, 300, 218)]; 
[secondSystem1 setBackgroundColor: [UIColor grayColor]]; 
[middleView addSubview:secondSystem1]; 

UIView *thirdSystem1 = [[UIView alloc] initWithFrame:CGRectMake(610, 0, 300, 218)]; 
[thirdSystem1 setBackgroundColor: [UIColor grayColor]]; 
[middleView addSubview:thirdSystem1]; 




CGSize scrollViewContentSize1 = CGSizeMake(2024, 218); 

[middleScrollView setContentSize:scrollViewContentSize1]; 
[middleScrollView addSubview:middleView]; 

任何人都可以幫助我嗎？

Answer 1

的問題是，您不添加您隨時隨地middleScrollView

改變這種

[RootView addSubview:middleView]; 

此

[RootView addSubview:middleScrollView];