how to change the size of UILabel

I have a UILabel coded programmatically. I want to change the size of the label when i pressed a button. how to change the 开发者_如何学Gosize of that label? this is my code

 UILabel *theLabel11 = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,30)];  
[theLabel11 setText:@"US"];
[theLabel11 setTextAlignment:UITextAlignmentCenter];
[theLabel11 setFont: [UIFont fontWithName:@"Arial" size:13.0f]];
[theLabel11 setBackgroundColor:[UIColor orangeColor]];
[theLabel11 setTextColor:[UIColor blackColor]];
[scroll1 addSubview:theLabel11];    

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You should declare your label as class property, so it can be accessed from other methods

To change the font size use

[theLabel11 setFont: [UIFont fontWithName:@"Arial" size:13.0f]];

To change the frame size of the label us

theLabel11.frame = CGRectMake(x, y, width, height);

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A common idiom for adjusting the spatial information on a UIView is as below

label.frame = CGRectMake(
    x,
    y,
    width,
    height
);

You can get the old position and height via

label.frame.origin.x
label.frame.origin.y
label.frame.size.width
label.frame.size.height

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If there is only one label added to scroll1 then, iterate the scrollview to get the label reference as follows in button action

for(UIView *subView in scroll1.subViews){

if([subView isKindOfClass:[UILabel class]]){
UILabel *lbl=(UILabel*)subView;
//change size of label here
}
}

if there are many labels assign a tag to each label while creating and check that in for loop