Thursday, April 1, 2010

Run symbolicatecrash from command prompt on any .crash file for your iPhone apps

1. copy symbolicatecrash from /Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKit.framework/Versions/A/Resources/ to a folder in desktop

2. copy the .app and .dSYM and .crash to the same folder

3. then run: ./symbolicatecrash .crash .app

Saturday, March 27, 2010

How to make images transparent on the fly in an iPhone app?

Recently I had to clean-up images on the fly. I didn't find anything by googling. After trying out different things , I ended up with the following piece of code that removes the white background from any image on the fly and makes it totally transparent

-(UIImage *)createMask:(UIImage*)temp {
size_t height = CGImageGetHeight(temp.CGImage);
size_t width = CGImageGetWidth(temp.CGImage);
UIGraphicsBeginImageContext(CGSizeMake(width, height));
CGContextRef context = UIGraphicsGetCurrentContext();
const float colorMasking[6] = { 255.0, 255.0, 255.0, 255.0, 255.0, 255.0};
CGImageRef maskedImageRef = CGImageCreateWithMaskingColors(temp.CGImage, colorMasking);
CGContextDrawImage (context, CGRectMake(0, 0, width, height), maskedImageRef);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
return image;
Note that you can give a range of colors to CGImageCreateWithMaskingColors..
How do we change the appearance of nav bar throughout the app?

Add this at the top of app delegate ..

@implementation UINavigationBar(MyOwn)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed:@"MyOwmImage.png"];
[image drawInRect:rect];

Now if we set the tint color of the nav bar then that will be used as the background color for all bar button items.

Like it?

Monday, February 16, 2009

App Approved

After one small glitch, my app is in app store. Take a look - VocabBuilder

Sunday, February 1, 2009

Today, I am submitting an app to iPhone app store. Check back later to see more info and status on the app.