xcode - UIRefreshControl 重复出现

Question

任何人都知道为什么 myscrollview 重复显示 UIRefreshControl 吗？

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

The problem is that you are creating this view in viewDidLayoutSubviews, which can be called multiple times. If you wish to only have one refresh control in your view, it should be created and added to the view in viewDidLoad which is called only once on loading the view controller.