Set UILabel with adjust content text..

CGSize sizeToMakeLabel = [label.text sizeWithFont:label.font]; 
label.frame = CGRectMake(label.frame.origin.x, label.frame.origin.y, 
sizeToMakeLabel.width, sizeToMakeLabel.height); 

use bellow method for adjust the height of UILable..

-(float) calculateHeightOfTextFromWidth:(NSString*) text: (UIFont*)withFont: (float)width :(UILineBreakMode)lineBreakMode

{

[text retain];

[withFont retain];

CGSize suggestedSize = [text sizeWithFont:withFont constrainedToSize:CGSizeMake(width, FLT_MAX) lineBreakMode:lineBreakMode];

[text release];

[withFont release];

return suggestedSize.height;

}

and use it like bellow..

    UILabel *lblAddress = [[UILabel alloc]init];

    [lblAddress setFrame:CGRectMake(110, 31, 200, 50)];        

    lblAddress.text = @"your Text ";

    lblAddress.lineBreakMode = UILineBreakModeWordWrap;

    lblAddress.numberOfLines = 0;

    lblAddress.font = [UIFont fontWithName:@"Helvetica" size:12];

    lblAddress.frame = CGRectMake(lblAddress.frame.origin.x, lblAddress.frame.origin.y, 

                             200,[self calculateHeightOfTextFromWidth:lblAddress.text :lblAddress.font :200 :UILineBreakModeWordWrap] ); 

    lblAddress.textColor = [UIColor darkGrayColor];

    [self.view addSubview:lblAddress];