ios webview url null problem

when i was trying to load a url in the uiWebView, my NSURL object is always nil when i init it this way:

NSURL *url = [[NSURL alloc] initWithString: urlString];

This is because:

If the string was malformed, returns nil.

This method expects URLString to contain any necessary percent escape codes, which are ‘:’, ‘/’, ‘%’, ‘#’, ‘;’, and ‘@’. Note that ‘%’ escapes are translated via UTF-8.

 

So I have to init it as follows:

NSURL *url = [[NSURL alloc] initWithString: [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

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