UILabel+UUResizing.h

//
//  UILabel+UUResizing.h
//  Useful Utilities - UILabel resizing extensions
//
//	License:
//  You are free to use this code for whatever purposes you desire. The only requirement is that you smile everytime you use it.
//
//  Contact: ryan@threejacks.com
//
//  These methods are handy when dynamically resizing and positions labels in
//  a subview.  Typically used in a UITableViewCell where you have a label
//  that you want to call sizeToFit on.  Before calling sizeToFit you need
//  to reset the frame to the original frame, or the sizeToFit will not
//  behave as expected.
//

#import <UIKit/UIKit.h>

@interface UILabel (UUResizing)

- (void) uuResizeWidth;
- (void) uuResizeWidthAndHeight;

@end

UILabel+UUResizing.m

//
//  UILabel+UUResizing.m
//  Useful Utilities - UILabel resizing extensions
//
//	License:
//  You are free to use this code for whatever purposes you desire. The only requirement is that you smile everytime you use it.
//
//  Contact: ryan@threejacks.com

#import "UILabel+UUResizing.h"
#import <objc/runtime.h>

#define kUILabelUUResizingOriginalFrameKey @"UILabelUUResizingOriginalFrameKey"

@implementation UILabel (UUResizing)

- (CGRect) uuOriginalFrame
{
    NSValue* val = objc_getAssociatedObject(self, kUILabelUUResizingOriginalFrameKey);
    if (!val)
    {
        val = [NSValue valueWithCGRect:self.frame];
        objc_setAssociatedObject(self, kUILabelUUResizingOriginalFrameKey, val, OBJC_ASSOCIATION_RETAIN);
    }
    
    return [val CGRectValue];
}

- (void) uuResizeWidth
{
    CGRect originalFrame = [self uuOriginalFrame];
    
    self.frame = originalFrame;
    [self sizeToFit];
    
    CGRect f = originalFrame;
    f.size.width = self.frame.size.width;
    self.frame = f;
}

- (void) uuResizeWidthAndHeight
{
    self.frame = [self uuOriginalFrame];
    [self sizeToFit];
}

@end