CODEWITHSUNDEEP
objective-cxcode4.5
Mark Stoneham
Mark Stoneham

Reputation: 73

Using NSString to call a function in XCode 4.x

I'm sure this is a simple question, but how can I call a function with [self MyFunction]; where 'MyFunction' is a NSString? I want to call functions using various variables which, when joined, form the function name (ie. FunctionName1, FunctionName2, etc.)

For example (simplified):

NSString *MyStringValue=@"FunctionName";
int MyNumber = 1;
NSString *MyFunction=[myStringValue stringByAppendingFormat:@"%d ",myNumber];

So I'm looking to call the function "FunctionName1" using:

[self MyFunction];

but that doesn't work. Can anyone help?

EDIT: Here's the full code that now works:

-(void)getnewblock {

    NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];

    NSNumber *actionblockload = nil;
    actionblockload = [standardUserDefaults objectForKey:@"actionblock"];
    int actionblock = [actionblockload intValue];

    NSString *block=@"setblock";
    NSString *blockanimate=@"blockanimate";

    NSString *blocktochange=[block stringByAppendingFormat:@"%d",actionblock];
    NSString *blocktoanimate=[blockanimate stringByAppendingFormat:@"%d",actionblock];

    SEL sel1 = NSSelectorFromString(blocktochange);
    SEL sel2 = NSSelectorFromString(blocktoanimate);

    [self performSelector:sel1];
    [self performSelector:sel2];

    [self setblockimages];
}

The only thing is I get the 'may cause a leak' message - although the app runs fine.

Upvotes: 1

Views: 3326

Answers (5)

K-AnGaMa
K-AnGaMa

Reputation: 66

If one can

NSString *stringMethode = @"MyMethodName"
SEL mySelector = NSSelectorFromString(stringMethode);

if([self respondsToSelector:mySelector]){

    [self performSelector:mySelector withObject:nil];

}else{
    //error not method
}

- (void)MyMethodName
{
    //call methode :)
}

Good luck ;)

Upvotes: 0

Yucel Bayram
Yucel Bayram

Reputation: 1663

Nsstring *newNsstring;
int *YourInt;

newNsstring =[NSString stringWithFormat:@"%@%d",yourNsstringName,yourInt,nil];

then you can edit only your new NSString but i dont think you can make it ur method's name

Upvotes: 0

Rad'Val
Rad'Val

Reputation: 9231

Welcome to Stackoverflow Mark.

In Cocoa Touch, what you refer to as a "function" is called "selector" (a method that has both a signature and a target) and has its own type SEL. In order to achieve what you want you need to first get the selector by name and then perform it. Here is some code to get you started:

-(void) yourMainMethod{

   NSString * methodName = @"calculateAcceleration";
   SEL sel = NSSelectorFromString(methodName);

   [self performSelector:sel];

}

-(void)calculateAcceleration
{
   NSLog(@"Called!");
}

Upvotes: 6

Ravi Raman
Ravi Raman

Reputation: 1070

In my opinion, it is not possible to have "NSString" as a method name.

But, you can have conditional checks so as to select a proper method that has to be executed.

Upvotes: 0

Hindu
Hindu

Reputation: 2914

You can use as below

SEL function = @selector(testFunction);
[self performSelector:function];

-(void)testFunction {

NSLog(@"ABC Test");

}

But Not Call NSString via self as function.

thanks

Upvotes: 0

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