nsmutablestring

I am getting an error 'Attempt to mutate immutable object with appendString:' and my code is NSMutableString *resultString= [[NSMutableString alloc]init]; for (NSMutableString *s in self.ArrayValue) { [resultString appendString:s]; NSLog(resultString); } ArrayValue is NSMutableArray. I am not able to understand where is the problem thank you in advance As posted, the code you have will not give you the error you describe. Probably, somewhere between allocating resultString and the for loop, you are overwriting it with a normal NSSring. Just do have like this: It works for me... NSMutableString

How do you append a unichar character to NSMutableString ? unichar c = 'T'; NSMutableString *s = [NSMutableString stringWithString:@"MyString"]; // want s to become "MyStringT" https://discussions.apple.com/thread/1679290 suggests: [s appendString:[NSString stringWithCharacters:&c length:1]]; Looks too long / complicated... Use [NSString appendFormat:], so for above: [s appendFormat:@"%C", c]; Enjoy! 来源： https://stackoverflow.com/questions/29357205/appending-unichar-to-nsmutablestring

I have an NSMutableString, how can I convert it to an NSString? Either via: NSString *immutableString = [NSString stringWithString:yourMutableString]; or via: NSString *immutableString = [[yourMutableString copy] autorelease]; //Note that calling [foo copy] on a mutable object of which there exists an immutable variant //such as NSMutableString, NSMutableArray, NSMutableDictionary from the Foundation framework //is expected to return an immutable copy. For a mutable copy call [foo mutableCopy] instead. Being a subclass of NSString however you can just cast it to an NSString NSString

I am trying to check to see if a string that I am going to use as URL starts with http. The way I am trying to check right now doesn't seem to be working. Here is my code: NSMutableString *temp = [[NSMutableString alloc] initWithString:@"http://"]; if ([businessWebsite rangeOfString:@"http"].location == NSNotFound){ NSString *temp2 = [[NSString alloc] init]; temp2 = businessWebsite; [temp appendString:temp2]; businessWebsite = temp2; NSLog(@"Updated BusinessWebsite is: %@", businessWebsite); } [web setBusinessWebsiteUrl:businessWebsite]; Any ideas? Try this: if ([myString hasPrefix:@"http"]) .

This question already has an answer here: What is the purpose of having both NSMutableString and NSString? 4 answers What is the difference between NSString and NSMutableString? [duplicate] 4 answers what is actual difference between NSString and NSMutable String in Objective-C? I have searched a lot but not getting any answer..I understand that NSString is Immutable object and NSMutableString is Mutable object but I want to understand the difference between them with the help of an example..Please help me.. now question has solved.. Dharmbir Singh Immutable String..... NSString *str1 = @

Is there any way to initialize NSString to NSMutableString? and also reverse order? -(void)st:(NSString *)st { NSMutableString str = st; // gives warning.. NSLog(@"string: %@", str); } NSString is an immutable representation (or a readonly view at worst). So you would need to either cast to a NSMutableString if you know it's mutable or make a mutable copy: -(void)st:(NSString *)st { NSMutableString *str = [[st mutableCopy] autorelease]; NSLog(@"string: %@", str); } I autoreleased it because mutableCopy returns a newly initialized copy with a retain count of 1. NSString *someImmutableString = @