几种长字符串的定义方式

// 长字符串换多行

NSString *string1 = @"ABCDEF \
                     GHIJKLMN";
    
NSString *string2 = @"ABCDEF"
                     "GHIJKLMN";
    
NSString *string3 = @"ABCDEF"
                    @"GHIJKLMN";
    
NSLog(@"string1 = '%@'", string1);
NSLog(@"string2 = '%@'", string2);
NSLog(@"string3 = '%@'", string3);