Archive for the “Cocoa” category
UITextView with Rounded Corners and Colored Border
by John Muchow on January 26, 2011
In a previous post, Add Rounded Corners and Border to UIWebview, I wrote a few lines of code to add rounded corners and a border color to a webview. A few people have inquired if this is also possible on (…)
Obfuscate / Encrypt a String (NSString)
by John Muchow on August 4, 2010
Apple Keychain Services offer a secure means to store sensitive information. Through the keychain, all the hardwork is managed for you to store and retrieve content. As powerful as the keychain services are, I was recently tinkering with some code (…)
Truncate a String and Append an Ellipsis, Respecting the Font Size
by John Muchow on July 26, 2010
A number of the UI related controls will automatically truncate and append ellipsis with no effort required on your part. For example, with UILabel you can specify the linebreak mode to indicate how you would like the system to manage (…)
NSNotification, UserInfo and Object Methods
by John Muchow on July 1, 2010
When working with an NSNotification object, you’ll want to familiarize yourself the userInfo dictionary, which provides access to any additional objects that may be of interest to the receiver. Understanding the object method may also be helpful if you are (…)
Add Rounded Corners and Border to UIWebview
by John Muchow on June 21, 2010
Beyond simply displaying websites, UIWebview can be a nice alternative when you need to display formatted text, not to mention the option of incorporating JavaScript which presents some very interesting scripting and UI opportunities. I’ve found webviews handy for presenting (…)
Formatting Numbers – NSNumberFormatter Examples
by John Muchow on June 16, 2010
The previous post on how to Get Total and Free Space on the Mounted File System is a good segue to this post, as the formatting of the output from the previous code example left a little to be desired, (…)
Overriding NSObject Description Method
by John Muchow on March 29, 2010
No doubt NSLog is your friend, I use it frequently to print messages to the console during development. Actually, I use a variation of the NSLog that prints messages to the console sans date, time and object information, you can (…)
Storing CGPoint, CGSize and CGRect in Collections with NSValue
by John Muchow on March 17, 2010
In an earlier post CGRect, CGSize and CGPoint Functions I demonstrated a number of geometry structures available for representing a point (CGPoint – x and y coordinates), size (CGSize – height and width) and rectangles (CGRect – combination of both). (…)
Get Application Icon Name
by John Muchow on February 17, 2010
In a previous post, Get Application Name, I wrote a line of code to get the application name from the app bundle. The line of code below is a slight modification that shows how to get the name that will (…)
NSRange and NSString Objects
by John Muchow on December 24, 2009
When poking around NSString methods you’ll find many references to NSRange, which is nothing more than a C structure that is helpful for describing a series of items, including a starting location and a count. For example, a range is (…)
Compare NSString Objects (Updated)
by John Muchow on December 21, 2009
This tip is for those new to Objective-C and Cocoa and walks through some basics on comparing NSString objects for equality. Compare NSString objects with == NSString *str1 = @"Homebrew"; NSString *str2 = @"Homebrew"; // This compares the addresses (…)
Download, Create and Display an Image from URL
by John Muchow on November 4, 2009
This tip will show the steps to download and display an image from a remote resource. This is handy if you need to add an image as a subview, yet, the image is not part of your application bundle. URL (…)
Date Formatter Examples – Take 4: Setting Locale
by John Muchow on July 7, 2009
A reader recently wrote and asked how to show a date output in a different language. By default, the NSDateFormatter will use the locale set on the device, so no code specific locale changes are required if you want your (…)
iPhone SDK 3 and Deprecated Method Warnings
by John Muchow on June 29, 2009
A side-effect of developing code on platforms that continue to evolve, is dealing with methods that become deprecated from one release to another. If you’ve spent anytime at all with Java, you are all too familiar with this concept. With (…)
UIColor Macros
by John Muchow on June 5, 2009
Below are two macros I paste inside every new iPhone project. Besides saving a few keystrokes, they work well when using the color picker application. Let’s look at the macros first: #define RGB(r, g, b) [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1] (…)
