Question

I have created an outlet collection for several buttons , now I need change the background of the buttons , here is my code but compiler gives me an error :

[outlet makeObjectsPerformSelector:@selector(setBackgroundImage:img forState:UIControlStateSelected)];

Error :

Expected ‘:’

how can I solve it ?

EDITED :

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 100, 50)];
imgView.image = [UIImage imageNamed:@"mask.png"];
[outlet makeObjectsPerformSelector:@selector(setBackgroundImage:)withObject:imgView];  
[imgView release];

Answer 1

You can’t put arguments in @selector(...). You need to use makeObjectsPerformSelector:withObject:, e.g. your code should be something like

[EsOutlet makeObjectsPerformSelector:@selector(setBackgroundImage:) withObject:img];

I say something like because I don’t think there’s a way to do this for a selector that takes more than one argument.