iOS--字符串拼接

NSString *str=[NSString initWithFormat:@"%@,%@" , a , b];
NSString *str=[a stringByAppendingString: b];
NSString *str=[string stringByAppendingFormat:@"%@,%@", a , b];

NSString* string; // 结果字符串

02NSString* string1, string2; //已存在的字符串，需要将string1和string2连接起来

03 

04//方法1.

05string = [NSString initWithFormat:@"%@,%@", string1, string2 ];

06 

07//方法2.

08string = [string1 stringByAppendingString:string2];

09 

10//方法3 .

11string = [string stringByAppendingFormat:@"%@,%@",string1, string2];