在追加到NSString时,我应该使用中间临时变量吗？

NSString *originalString = @"Hello, ";
NSString *newString = @"world!";

// 使用NSString的stringByAppendingString方法
NSString *combinedString = [originalString stringByAppendingString:newString];

NSLog(@"Combined string: %@", combinedString);

NSMutableString *originalString = [NSMutableString stringWithString:@"Hello, "];
NSString *newString = @"world!";

// 使用NSMutableString的appendString方法
[originalString appendString:newString];

NSLog(@"Combined string: %@", originalString);