Mobile Developer Tips » Data / File Management

Sort A Dictionary By Value Of Each Key-Value Pair

John Muchow — Wed, 16 May 2012 08:30:07 +0000

Sort A Dictionary By Value Of Each Key-Value Pair is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved You can sort the values in a dictionary using the method keysSortedByValueUsingSelector:. The result is an array of keys from the dictionary, which represent the sorted values of the key-value pair. Let’s say for example [...] Related posts:

Add Comma Separators to Numbers

John Muchow — Mon, 14 May 2012 11:11:55 +0000

Add Comma Separators to Numbers is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved Seems a common question, how can I format a number such as 123456 to look like 123,456? The NSNumberFormatter makes this quite easy. NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease]; [formatter setNumberStyle:NSNumberFormatterDecimalStyle]; double d = 234567.89; int i [...] Related posts:

Get Image Data Including Depth, Color Model, DPI and More

John Muchow — Tue, 08 May 2012 07:12:51 +0000

Get Image Data Including Depth, Color Model, DPI and More is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved Although you can get some basic information if you load an image into a UIImage object, at times it can be helpful to more about an image, for example, the color model (RGB, CMYK, [...] Related posts:

Overview of iOS Application Directories

John Muchow — Thu, 03 May 2012 06:45:18 +0000

Overview of iOS Application Directories is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved iOS applications have a limited number of directories available for writing content, the design intent is to ensure application security. This post will give a quick run down of the folder locations available in an iOS application and their [...] Related posts:

Count The Number of Words in a String

John Muchow — Mon, 16 Apr 2012 09:02:20 +0000

Count The Number of Words in a String is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved Here’s a quick way to count the number of words in an NSString object. The trick is to use the character set whitespaceAndNewlineCharacterSet which will look for spaces, tabs and newline characters. - (NSUInteger)wordCount:(NSString *)str { [...] Related posts:

Register File Types to Associate File Extension with an App

John Muchow — Wed, 28 Mar 2012 08:27:01 +0000

Register File Types to Associate File Extension with an App is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved If you would like other applications to open your app based on a file type, you can register your document request in the application plist file. Include the CFBundleDocumentTypes key, which is an array [...] Related posts:

Delete All Files in Documents Directory

John Muchow — Tue, 17 Jan 2012 02:09:15 +0000

Delete All Files in Documents Directory is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved In a recent project, I was using iTunes File Sharing to store various log files and test data. Although you can quickly delete all the files in the Documents directory using iTunes, I also was looking for a [...] Related posts:

Preview Documents Tutorial with QLPreviewController

John Muchow — Mon, 09 May 2011 11:04:05 +0000

Preview Documents Tutorial with QLPreviewController is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved For the past few months I’ve been meaning to spend some time to check out the quick look document previewer on iOS – what follows is a short app that I wrote to get familiar with the QLPreviewController API. [...] Related posts:

Get Users Home Directory – Part 1

Get Total and Free Space on the Mounted File System

John Muchow — Mon, 14 Jun 2010 12:27:09 +0000

Get Total and Free Space on the Mounted File System is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved I recently was writing code to manage the download and storing of mp4 files to enable an application to play movies off-line. One consideration when dealing with files of significant size (50-100 megs) is [...] Related posts:

Read Files from the Application Bundle

John Muchow — Wed, 31 Mar 2010 08:09:30 +0000

Read Files from the Application Bundle is protected by Copyright © MobileDeveloperTips.com 2008-2012 • All Rights Reserved Below are a few lines of code to get you started if you need to open and read a file that is stored in the application bundle. Files could be anything from help text that your application displays [...] Related posts: