开发环境：XCODE4.6.3
IOS sdk：6.1 + ARC
问题描述： 在使用pullToRefresh做下拉刷新时，出现错误，代码如下
Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <PullingRefreshTableView 0x80b0a00> for the key path "contentSize" from <PullingRefreshTableView 0x80b0a00> because it is not registered as an observer.'
解决方法如下：
Change the property in PullToRefreshView.h to this:
@property (nonatomic, strong) id<PullToRefreshViewDelegate> delegate;
So change it from “assign” to “strong”.
参考资料：http://sonnyparlin.com/2011/12/pulltorefresh-ios-5-and-arc-tutorial/
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