拼接：
NSArray?*pathArray?=?[NSArray?arrayWithObjects:@"here", ?@"be",?@"dragons",?nil]; ?
NSLog(@"%@",[pathArray?componentsJoinedByString:@"?"]);
分割：
NSString*?str?=?@"here?be?dragons";??
[str?componentsSeparatedByString:@"?"];??
for(NSString*?s?in?str)?NSLog(s);
去空格:
NSString
*number_temp = [number stringByReplacingOccurrencesOfString:@" " withString:@""];
轉(zhuǎn)UTF-8:
NSString *bb = [s?stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
