[iOS] NSString 문자열 연결 예제

// string3 = string1 + string2
NSString *string1 = @"문자열1";
NSString *string2 = @"문자열2";
NSString *string3 = [string1 stringByAppendingString:string2];

// string1 = string1 + string2
NSString *string1 = @"This is";
NSString *string2 = @" a test.";
string1 = [string1 stringByAppendingString:string2];

// NSMutableString을 사용
NSMutableString *string1 = @"This is";
NSString *string2 = @" a test.";
[string1 appendString:string2];