1. string = [NSString initWithFormat:@"%@,%@", string1, string2 ];
2. string = [string1 stringByAppendingString:string2];
3 . string = [string stringByAppendingFormat:@"%@,%@",string1, string2];1. string = [NSString initWithFormat:@"%@,%@", string1, string2 ];
2. string = [string1 stringByAppendingString:string2];
3 . string = [string stringByAppendingFormat:@"%@,%@",string1, string2];
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