IOS

The map control mkmapview is often used in iOS development. You can use the following method to obtain the latitude and longitude of a modified point when you click a certain point in mkmapview: If a mkmapview is declared as mymapview 1. Add a

You can automatically wrap a line and adjust the font size based on the length of the string. Code: _ Label = [[uilabel alloc] initwithframe: cgrectmake (20,280,280,100)]; _ label. textalignment = uitextalignmentcenter; _ label.

Definition Category (Category) YesObjective-CNew features of the language to add new methods for existing classes. Limitations: 1. You cannot add new instance variables. 2. Conflict with the method name of the class. When a name conflict occurs,

We all know that @ property and @ synthesize can automatically generate an access method for a class member variable. However, they may not be very familiar with some properties in property, and some on the Internet are not very correct, it may

1. llvm3.0 must be used to use arc. llvm3.0 has a powerful new feature called automatic reference counting. After this option is enabled, llvm will automatically help developers to manage the memory manually during the compilation phase. At the same

In the near future, we need to add the video capture function to the iPhone's streaming application to sort out our actual work experience. Step 1. Use FFMPEG to obtain the image information in the stream and perform decoding.

When creating a project, I hope to operate according to this variable specification. When other people look at it, check it, and change your code, I will be aware of it, instead of saying, this silly code is so messy. Very useful. Share it! Code

Animation effects provide a smooth user experience during status or page conversion. In iOS, we do not need to write the animation code by ourselves, core animation provides a variety of APIs to achieve the animation effect you need. Uikit only uses

IOS serialization and deserialization Opening 1. What is the purpose of serialization? An object-oriented program creates a complex object graph during running. It is often serialized in binary mode. This process is called archiving. binary streams

Object-c   // Hide the keyboard with a touch screen Did end on exit calls the following events. When you click return on the keyboard, the keyboard is hidden. -(Ibaction) textfieldshouldreturn :( uitextfield *) textfield { // [Sender

  Summary:In iOS, you can directly call a message of an object. One of the two methods is receivmselector: withobject. The other is nsinvocation. The first method is relatively simple and can complete simple calls. But for processing two parameters

IOS developers use delegate to transmit data between different windows This article from: http://mobile.51cto.com/iphone-284116.htm This document describes how to use delegate to transmit data between different windows. For more information, see the

1. Start nsxmlparser To use nsxmlparser, you must first create it and set various attributes. The following methods are used: Initwithcontentsofurl creates a parser through nsurl InitwithdataCreate a parser through nsdata, for example, xmlpaser =

Some time ago, I went online to find out how to release the memory. However, you cannot find it. Today, I am continuously testing and viewing the parent window of the view. Nslog (@ "% @", self. View. superview. superview ); At this time, I found

Cgimage and cgimageref should be two classes used to redraw images. They are used to draw images based on the pixel matrix of the images, which can be used to process bitmap. Mutual conversion between cgimageref and uiimage   Cgimageref to uiimage

During application development, the page needs to be loaded when loading data. If it is useless, there is a lack of human design. The system comes with the uiactivityindicatorview, but it lacks the text description. The loading view to be added with

1. Change the background of the cell. UIView *cellView = [[UIView alloc] init];cellView.frame = CGRectMake(0, 0, 320, 44);cellView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"xxx.png"]];cell.selectedBackgroundView =

Required * request = [required requestwithurl: [nsurl urlwithstring: @ "required"] cachepolicy: Required timeoutinterval: 30.0]; [nsurlconnection failed: Request queue: [nsoperationqueue mainqueue] completionhandler: ^ (nsurlresponse * response,

Uiscrollview is a control that we often use during project development. 1. Initialization //init UIScrollView *scrollView = [[UIScrollView alloc] init]; [scrollView setFrame:CGRectMake(0, 0, self.view.frame.size.width,

Network Programming usually goes through the request --- connection --- response (request -- connection -- Response) process. The general steps are as follows: 1. Create an nsurl first. 2. Create an nsurlrequest using the specified URL. You can also