NSString 和 NSURL的互相轉換
NSString *str = @"www.baidu.com";
NSURL *URL = [NSURL URLWithString:str]; //string>url
NSString *str1 = [URL absoluteString]; //url>string
NSString 和 NSURL的互相轉換
NSString *str = @"www.baidu.com";
NSURL *URL = [NSURL URLWithString:str]; //string>url
NSString *str1 = [URL absoluteString]; //url>string
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