iPhone | Convert UILabel to Circle

This is how you can convert a UILabel to circle:

steps:

1)Add Quartz Core framework to application frameworks

2) Import QuartzCore.h file to implementation file.

3) #define kRectArmLength 24.0 (Not necessary, as you can decide while initializing label with frame)

//Label will be a square (equal width & height)

UILabel *lblCircle = [[UILabel alloc] initWithFrame:CGRectMake(10,20, kRectArmLength, kRectArmLength)];

//set corner radius just half of the square arm length

lblCircle.layer.cornerRadius= kRectArmLength/2;

lblCircle.clipsToBounds=YES;

lblCircle.backgroundColor = [UIColor redColor];

[self.view adsSubview: lblCircle];

Phonegap | Whitelist rejection in phonegap compilation with Xcode

While having an other domain server based service. Our phonegap application failed with ERROR logs :
whitelist rejection in phonegap compilation
The solution is to Whitelist (allow) the host to be accessible via phonegap, to accomplish it

In Phonegap.plist file,
Add new row to External Host (Key value pair)
for value, put your host name : (SERVER.COM).
e.g.
1) ERROR whitelist rejection: url('http://localhost:XXXX/myproject/index')
Type: localhost in value column for for External Host
2) ERROR whitelist rejection: url('http://myserver.com/dashboard/mobilews.php?')
Type: myserver in value column for External Host


May be putting "*" , the asterisk as a value of the host that references an external URL , will do the trick. but not safe.

hope this helps, It works great for us :)

see my comments below for more info, as phonegap is cordova now!

iPhone build error | Codesign failed with exit code 1| object file format invalid or unsuitable

Recently, I have installed Xcode 4.x, this have shown weird errors with existing app , and asked for a lot of change to make it compatible with new complier.
Project timelines are always important, So I reverted back to Xcode 3.2.6

Everything went Okay. But when I tried to apply ( code signing) provisioning certificates to install application into iPhone, Build Failed with error;
Command /usr/bin/codesign failed with exit code 1
with description-
{*}.app object file format invalid or unsuitable


Then I moved to the solution library of developers (stack overflow), As most of the the developers do :)
After spending lot of hours, Saw this answer by emcmanus.

sudo mv /usr/bin/codesign_allocate /usr/bin/codesign_allocate_old
sudo ln -s /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/codesign_allocate /usr/bin


Tried first command, Blindly..
My terminal CLI answered : No such file or directory!

Then, I Explored /usr/bin folder, and observed yes! It was not there. (there is nothing to keep as back up , after renaming it. Symlinking is the ultimate goal )
I run "sudo ln -s /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/codesign_allocate /usr/bin"
to create symlink.
and YES! symlink did the trick...


Excellent... Hope this will do the trick for, who is in this trap :)

iPhone | code crash : Mutated Collection during fast enumeration

If you are going to use , fast enumeration in your objective C code?
for (id {object} in {collection}) {...}" )

You shall not be able to modify the collection (add or remove) during enumeration.
Because, thread will have a lock on the resources being used.

for that either go with the :

1) for(NSUInteger i=0 ; i< [ {collection} length];i++){…}
2) Put the add/remove logic in another thread

Hope this helps!

Shipment Tracker - Package tracking app for US

Shipment Tracker is live on app store :)
Developed this application for Appcandy productions.

http://itunes.apple.com/us/app/shipment-tracker/id471306380?mt=8

Cheers!

iPhone | UIImage

I was reading a blog article "How to use optimized Image in iPhone Development?",

That article suggests, it is best to use “imageWithContentsOfFile” over [UImage imageNamed:@"YOUR_IMAGE_NAME"]; because image name will not flush image out of memory even if it is set to nil.

Correct! it will not flush, But its good to keep that image in cache, Most of the time, application user moves to-and-fro in app ,
So its not a good idea to get it always from main bundle and get it converted everytime!

Sharing the good part of UIImage:

As per apple developer reference guide for UIImage imageNamed method:

+ (UIImage *)imageNamed:(NSString *)name

name
The name of the file. If this is the first time the image is being loaded, the method looks for an image with the specified name in the application’s main bundle.
If a matching image object is not already in the cache, this method loads the image data from the specified file, caches it, and then returns the resulting object.

Return Value
The image object for the specified file, or nil if the method could not find the specified image.

On a device running iOS 4 or later, the behavior is identical if the device’s screen has a scale of 1.0. If the screen has a scale of 2.0, this method first searches for an image file with the same filename with an @2x suffix appended to it. For example, if the file’s name is button, it first searches for button@2x. If it finds a 2x, it loads that image and sets the scale property of the returned UIImage object to 2.0. Otherwise, it loads the unmodified filename and sets the scale property to 1.0.
Special Considerations
On iOS 4 and later, if the file is in PNG format, it is not necessary to specify the .PNG filename extension. Prior to iOS 4, you must specify the filename extension.

iPhone | Customize the UITableView header and footer view

To Customize the table header and footer view , Just go fo it....

   CGRect newFrame = CGRectMake(0.0, 0.0, self.tableView.bounds.size.width, self.myHeaderView.frame.size.height);
   self.myHeaderView.backgroundColor = [UIColor clearColor];
   self.myHeaderView.frame = newFrame;
   self.tableView.tableHeaderView = self.myHeaderView; // note this will override UITableView's 'sectionHeaderHeight' property
  
   // set up the table's footer view based on our UIView 'myFooterView' outlet
   newFrame = CGRectMake(0.0, 0.0, self.tableView.bounds.size.width, self.myFooterView.frame.size.height);
   self.myFooterView.backgroundColor = [UIColor clearColor];
   self.myFooterView.frame = newFrame;
   self.tableView.tableFooterView = self.myFooterView; // note this will override UITableView's 'sectionFooterHeight' property