Disable deprecated warnings with GCC

Mitch — Fri, 27 Aug 2010 10:32:22 +0000

Recently I wrote some conditional code to call various methods depending on the version of iOS running on the device. A problem I came across was that because I still called some deprecated methods I was getting warnings during my build. As I treat all warnings as errors I had to find a solution which would compile. #pragma was the answer.

You can use the following line to disable warnings for depreciated calls:

#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

And use this to re-enable it:

#pragma GCC diagnostic warning "-Wdeprecated-declarations"

Here’s how I used it:

#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
- (id) initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString*)reuseIdentifier
{
  if([super respondsToSelector:@selector(initWithStyle:reuseIdentifier:)])
  {
    if(self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])
    {
      [self setupCell];
    }
  }
  else
  {
    if(self = [super initWithFrame:CGRectZero reuseIdentifier:reuseIdentifier])
    {
      [self setupCell];
    }
  }
  return self;
}
#pragma GCC diagnostic warning "-Wdeprecated-declarations"

Customisable UIPageControl

Mitch — Wed, 02 Dec 2009 14:12:12 +0000

PageControl Examples

The UIPageControl has no way of changing the colors of the dots. Kind of annoying right? Well I knocked up a simple solution to customising the look of the UIPageControl.

This class allows you to replace the dots with your own UIImages, with the following 2 properties:

@property (nonatomic, readwrite, retain) UIImage* imageNormal;
@property (nonatomic, readwrite, retain) UIImage* imageCurrent;

It works by replacing the UIImage on the UIImageView containing the original dot.

One word of warning, if Apple change the way the UIPageControl works, this code will most likely break (especially if they change the dots so they are no longer UIImageViews!). However I’d say the only reason this would happen, is if they add their own functionality in to customise the look of it, so it’s probably OK.

Here’s the full code, in all it’s glory. Feel free to use how you see fit (I’m releasing this with no restrictions). It’s not very complicated, but I figured it might be useful to someone!

#import 
 
@interface OMPageControl : UIPageControl {
  UIImage* mImageNormal;
  UIImage* mImageCurrent;
}
 
@property (nonatomic, readwrite, retain) UIImage* imageNormal;
@property (nonatomic, readwrite, retain) UIImage* imageCurrent;
 
@end

#import "OMPageControl.h"
 
@interface OMPageControl (Private)
- (void) updateDots;
@end
 
 
@implementation OMPageControl
 
@synthesize imageNormal = mImageNormal;
@synthesize imageCurrent = mImageCurrent;
 
- (void) dealloc
{
  [mImageNormal release], mImageNormal = nil;
  [mImageCurrent release], mImageCurrent = nil;
 
	[super dealloc];
}
 
 
/** override to update dots */
- (void) setCurrentPage:(NSInteger)currentPage
{
  [super setCurrentPage:currentPage];
 
  // update dot views
  [self updateDots];
}
 
/** override to update dots */
- (void) updateCurrentPageDisplay
{
  [super updateCurrentPageDisplay];
 
  // update dot views
  [self updateDots];
}
 
/** Override setImageNormal */
- (void) setImageNormal:(UIImage*)image
{
  [mImageNormal release];
  mImageNormal = [image retain];
 
  // update dot views
  [self updateDots];
}
 
/** Override setImageCurrent */
- (void) setImageCurrent:(UIImage*)image
{
  [mImageCurrent release];
  mImageCurrent = [image retain];
 
  // update dot views
  [self updateDots];
}
 
/** Override to fix when dots are directly clicked */
- (void) endTrackingWithTouch:(UITouch*)touch withEvent:(UIEvent*)event 
{
  [super endTrackingWithTouch:touch withEvent:event];
 
  [self updateDots];
}
 
#pragma mark - (Private)
 
- (void) updateDots
{
  if(mImageCurrent || mImageNormal)
  {
    // Get subviews
    NSArray* dotViews = self.subviews;
    for(int i = 0; i < dotViews.count; ++i)
    {
      UIImageView* dot = [dotViews objectAtIndex:i];
      // Set image
      dot.image = (i == self.currentPage) ? mImageCurrent : mImageNormal;
    }
  }
}
 
@end

OniDev » Code Examples

Disable deprecated warnings with GCC

Customisable UIPageControl