IOS

In IOS programming, memory operations are inseparable. When I first came into contact with IOS programming, this is always caused by such memory problems.ProgramCrash. In fact, the release of memory in IOS programming is relatively simple. You

# DEFINE _ uikeyboardframeenduserinfokey (& uikeyboardframeenduserinfokey! = NULL? Uikeyboardframeenduserinfokey :@"Uikeyboardboundsuserinfokey") Add the notification observer and event during viewwillappear. [[Nsicationcenter center

Step 1: add the fmdb class library to the project in the new project, Step 2: Put the. DB database in the following directory: /Users/Apple/library/Application Support/iPhone

Xcode is updated to 4.6 and supports IOS 6.1. The latest version 4.6 is released. The new version adds a compiler warning to identify potential bugs caused by the use of arc and weak references. The analysis function supports deeper objective-C and

If your app uses coredata technology, crash will occur when you modify the DB field and upgrade it to the new version. because only the application app is upgraded, the DB files in the update directory are not. If it is under development, you only

In objective-C, there are both instance methods and class methods. Class methods are sometimes called factory methods or convenience methods ). Factory methods are obviously different from factory methods in the general sense. In essence, class

When developing the map app, we found that the SDK did not set the map zoom level. To display the map, we set its center point and then use a span to control the display area, you will ask, what is span? In fact, it is also related to latitude and

There are a lot of delegate ideas in IOS programming, and many beginners do not understand what delegate is. Delegation ModeIt is a basic technique in software design patterns. In the delegate mode, two objects are involved in processing the same

The following uses tcfexam. dB as an example. //----Method 1 SlaveDocumentRead----------// // Nsarray * paths = nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, yes ); // Nsstring * documentpath = [paths

Refer to the methods in xcode3. For details, see: Http://www.voland.com.cn/iphone-use-nslocalizedstring-internationalization Http://blog.csdn.net/kmyhy/article/details/6237677 The method is to first createLocalizable. Strings file, add

In the software testing phase, to collect more bug information, you can create a crash server to collect crash logs so that technicians can fix them easily. Some information is collected:

In web development, running horse lights are often used to display notifications. This is also true in game development. The followingCodeSegment can achieve the effect of running the horse lights in iOS, [Labelshow sizetofit]; cgrect frame =

1. What is runtime? Runtime refers to the state in which a program is running (or executed.That is to say, when you open a program to make it run on the computer, the program is in the running time. In some programming languages, some reusable

Source: http://iosdeveloper.diandian.com/post/2012-11-16/40041182749 Core text is a text rendering engine for iOS 3.2 + and OSX 10.5 +, allowing you to freely control the text format and layout. Core text is different from uikit and core

Small screen code. Pay attention to setting the height and region. Release the sendimage if it is not under arc. // Uigraphicsbeginimagecontextwitexceptions (cgsizemake (640,960), yes, 0); [self. layer renderincontext:

The Forum saw the question of a middleware: "Can an asynchronous request encapsulate a common class? Each page needs to copy several methods, which makes it very troublesome. Many people may have the same problem, so I started a blog to talk about

  The navigation controller can display itself in several different styles. The default style is the standard gray appearance. Currently, three different styles are supported. Fengge Description Uibarstyledefault Default

Use gestures to remove the iOS app's digital tip badge. You can set the app whitelist. · Apple designed a digital badge for iOS app icons, which is very convenient for some social communication software, however, when other software updates or

IOS programming multi-view application experience after completion The development platform using xcode is different from the development platform using C ++ builder: 1. xcode creates a window-base project similar to a Forms Application project

IOS type conversion IOS code 1 nsstring * Tempa = @" 123 "; 2 nsstring * tempb = @" 456 "; 1. String concatenation IOS code 3 nsstring * newstring = [nsstring stringwithformat: @ "% @", Tempa, tempb]; 2, convert character to int IOS code 4