NSString拼接字符串

NSString* string; // 字符串

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

• //方法1.

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

• //方法2.

string = [string1 stringByAppendingString:string2];

• //方法3 .

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