iOS url出现特殊字符处理 -- stringByAddingPercentEncodingWithAllowedCharacters

URLFragmentAllowedCharacterSet  \"#%<>[\\]^`{|}

URLHostAllowedCharacterSet      \"#%/<>?@\\^`{|}

URLPasswordAllowedCharacterSet  \"#%/:<>?@[\\]^`{|}

URLPathAllowedCharacterSet      \"#%;<>?[\\]^`{|}

URLQueryAllowedCharacterSet    \"#%<>[\\]^`{|}

URLUserAllowedCharacterSet      \"#%/:<>?@[\\]^`

let customAllowedSet =  NSCharacterSet(charactersInString:\"`#%^{}\\\"[]|\\\\<> \").invertedSet

NSString *urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[[NSCharacterSet characterSetWithCharactersInString:@\"?!@#$^&%*+,:;=\'\\\"`<>()[]{}/\\\\| \"] invertedSet]];