摘要： 1.NSURL 与 NSString 1)NSURL 转 NSString:NSString * urlStr = [url absoluteString]; 2)NSString 转 NSURL:NSURL * url = [NSURL URLWithString:urlStr];NSURL * url = [[NSURL alloc] initWithString:urlStr];2.NSString 与 char 1)NSString 转 charNSString *_urlStr = @"www";const char *url = [_urlStr cString 阅读全文