IOS

Block can be used to define any code snippet and pass it into another method like an object. It is a c-level syntax, which is very similar to the function pointer in c language. In C language, function pointers and blocks are written as

# Pragma mark-UIScrollViewDelegate delegate // This method is called when scrollView is rolled. This method is called when any offset value is changed. That is, multiple calls are called during the rolling process. -(Void) scrollViewDidScroll :(

This simple question has always been told by five years of Apple development experience that it is not worth mentioning and there is nothing to mention. However, today I have made a mistake that is not worth mentioning. For a long time, I think it

  I. Implementation results In this program, seven controls, three descriptive labels, three output ports, and one button are used. Ii. Code attributes Attributes used: Three output labels and one button One button Method   # Import   @ Interface

1. Obtain the absolute path of the file in the application package: NSString *absoluteFileName = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"filename.ext"]; 2. Obtain the absolute path of the file under the root directory

Study Summary 12-23: Click any three points on the screen to determine a triangle.1. One of the drawRect methods is:-(void) drawRect :( CGRect) rect{// Obtain the context based on the ImageCGContextRef context = UIGraphicsGetCurrentContext ();//

There are many options when talking about iPhone XML parsing. The iPhone SDK has two different libraries available and several popular third-party libraries available, such as TBXML, TouchXML, KissXML, TinyXML, and GDataXML. How do I select the best

You can also use the UIPasteboard class when using clipboard in applications. The first step is to obtain a single instance of UIPasteBoard. You can use the generalPasteboard method to obtain this single instance. You can use the UIMenuController

Sometimes there are multiple languages involved in the product, so you need to set up internationalization. Now, record it. First, if you want to internationalize the product, select Localizations in info under the PROJECT, and click the + number,

1. Shallow copy: Car *car=[[[self class] allocWithZone:zone] init]; car.engine=_engine; car.name=_name; car.weight=_weight; return car; Test code: Car * car = [[Car alloc] init]; Engine * engine = [[Engine alloc] init]; car.

IOS devices can be touched by multiple points, that is, the fingers are placed on the screen of the iOS device and dragged or lifted from the screen. The current view of the system responds to the touch event. If there is no response, it is passed

Before you start IOS7 introduces some changes to the interface, such as borderless buttons, translucent tab bar, and full-screen View Controller layout. With Xcode 5, you can create an iOS7 project and view the Running Effect of the application on

Multithreading is mainly used to perform some time-consuming operations, such as downloading resources such as network images, videos, songs, books, and playing music in the game. It gives full play to the advantages of multi-core processors,

This book is close to learning . According to the tutorials in this book, I wrote this simple Ios mini-program itahdo.pdf. this is a simple task management program. you can use the "Insert" button to Insert data. after reading the official

In iOS7, Apple introduced the new API NSURLSession, which is used to replace NSURLConnection.NSURLSession brings these new benefits: Background upload and download You can pause and continue to connect to the network. Save Configuration

  I, Svn checkout Chlorophyll Create a clh folder in the MAC account and download the items in the SVN account.   Cd to which directory.   Ls to Browse Directory files.   Cd ~ /Find the root directory.   Create a new file using mkdir   Pwd writes

Note: remove the prefix and lowercase letters, such as the class name. The reference counter is used to calculate the number of times an object is referenced. ),

Cause: the attributes associated with the storyboard are deleted, but the previously associated attributes are maintained in the storyboard. Solution: 　　   Solution: Check this 1. Click   2. It will be displayed   3. Select, which indicates that X

• Dynamic Animator: an animation that provides physics-related capabilities and animations for Dynamic elements, as well as context for these elements. It is an intermediary between Dynamic elements and the underlying iOS physical engine, add a

This time I started to learn about iOS7's new UIKit Dynamics. I think some people translate it into UIKit mechanics. I think it is quite appropriate, so I borrowed it for a usage.This UIKit Department of mechanics has four things to design: 1.