iOS7使用iOS8上的方法报错处理

问题描述

我们经常会遇到在低版本上使用高版本方法导致的bug，例如：

WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: -[__NSCFString containsString:]: unrecognized selector sent to instance 该方法就是在iOS8上的方法，在iOS7的设备上使用的时候就会导致该bug。

解决方法

使用低版本中的方法代替所使用的方法，或者使用可以兼容高低版本的方法。例如该bug可以使用- (NSRange)rangeOfString:(NSString *)searchString

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