iOS Question WebView error


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When try to make WebView load url that include non English characters ,i get this error
*** WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: <NSInvalidArgumentException> *** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]

on of the solution for ios ,its need to use percent-encoding in the URLs to make things work
any idea how to do that ,or how to solve above problem