CODEWITHSUNDEEP
iphoneviewbackground-color
Duck
Duck

Reputation: 35993

iphone - changing the background color of several views in a loop

I have to change the background color of several views that have the same base name like color1, color2, color3, etc., to the same color

I could simply do something like

color1.backgroundColor = theColor;
color2.backgroundColor = theColor;
color3.backgroundColor = theColor;
color4.backgroundColor = theColor;
...

but I would rather do that in a more elegant way using a loop, something like

NSString *baseName = @"color";
for (int i=1; i<numberOfViews; i++) {
  NSString *tempName = [NSString stringWithFormat:@"%@%d", baseName, i];
  // now that I have the correct name of the view as a string on tempName
  // how do I reference the view which name is on tempName, so I can change its color?
}

thanks.

Upvotes: 1

Views: 157

Answers (1)

benzado
benzado

Reputation: 84338

The approach you are trying to take would work in a language like JavaScript that allows you to take a string of text and send it to the interpreter at runtime. As a compiled language, Objective-C doesn't allow this.

Instead, you need to put your views in an array first, then you can iterate through them. The easiest way would be:

NSArray *views = [NSArray arrayWithObjects:color1, color2, color3, color4, nil];
for (UIView *v in views) {
    v.backgroundColor = theColor;
}

Upvotes: 4

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