UIRefreshControl apile in duplicate

Question

任何人都知道为什么myscrollview显示重复的UIRefreshControl？

UIRefreshControl *refreshControl; 
refreshControl = [[UIRefreshControl alloc] initWithFrame:CGRectMake(0, 0, 20, 20)]; 
refreshControl.tintColor = [UIColor grayColor]; 
[refreshControl addTarget:self action:@selector(updateTableScroll:) forControlEvents:UIControlEventValueChanged]; 
[_myScrollView addSubview:refreshControl]; 
[refreshControl setAutoresizingMask:(UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleLeftMargin)]; 

[[refreshControl.subviews objectAtIndex:0] setFrame:CGRectMake(0, 50, refreshControl.frame.size.width, refreshControl.frame.size.height)]; //padding in Y axis 

ImageLink->https://dl.dropboxusercontent.com/u/14600481/Untitled-1.png

Answer 1

的问题是，你正在创建这一观点在viewDidLayoutSubviews，可多次调用。如果您希望在视图中只有一个刷新控件，则应该创建该控件并将其添加到viewDidLoad中的视图中，该视图在加载视图控制器时仅调用一次。