IOS

Calculate the distance method according to two point longitude and latitude: -(double) LatitudeAndLongitudeWithLon1: (double) lon1 LAT1: (double) lat1 Lon2: (double) lon2 lat2: (double) lat2{Double er = 6378137; 6378700.0f;Ave. Radius = 6371.315

1. Create a custom Uicollectionviewcell Selected works, right key-new File ... Select "Cocoa Touch Class"-next, choose to inherit from the Uicollectionviewcell class, give a reasonable name Collectionviewcell, and then complete the Next. 1

When you use the navigation controller Navigationcontroller to jump to another page, you can return to the previous layer by sliding to the left of the left corner of the screen, except by clicking the return button on the left-hand side. However,

To achieve a simple uitabbar: Appdelegate.m The code is as follows Copy Code -(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (nsdictionary *) launchOptions{Self.window = [[UIWindow

What software is iOS sync push? Synchronous push is a vast amount of genuine resources to download the platform, it can be free for iOS users to download genuine applications. A key for your free installation, there is no charge item. Help users

The marquee effect of the scroll bar, generally appears at the bottom of iOS applications. Information used to display dynamic changes or long content, widely used in a class of applicationsThe following two types of Marqueebar are available for the

iOS sandbox mechanism, applications can only access files in their own application directory. Unlike Android, iOS does not have the SD card concept to directly access images, video, and more. The content produced by iOS applications, such as images,

Objective We all know that development has been inseparable from a number of common verification formats, such as: mailbox, mobile phone number, etc., in the development process will generally create a new tool class, specialized management of

How IOS prevents multiple clicks on a button multiple times A bug is often encountered in daily development because the user clicks a button quickly, causing the page to repeat the push or repeat the network request. Such problems can have an

Objective This article is mainly to introduce the use of iOS to achieve Taobao pull into the details page interaction effect, the following words do not say more, to see the detailed implementation process. Implementation analysis As you can see,

IOS hidden navigation bar and status bar implementation method The height of the status bar is 20, the height of the navigation bar is 44, and if the navigation bar of the status bar is present, we typically set the position of the control on the

iOS constraint conflicts generally fall into two categories: Margin constraint conflicts or dimension collisions, which can often be modified by modifying the constraint precedence of one of the controls, using the content hugging/content

iOS has the following three kinds of random number method: The first type of Srand ((unsigned) time (0));//Do not add the random number that each generation is invariant int i = rand ()% 5; The second type of srandom (time (0)); int i = random (

First in Interface Builder select Textfields, and then in the text Field attributes found text Input Traits, select Return key for done. Ok Defining methods -(Ibaction) textfielddoneediting: (ID) sender; Press the done key to close the keyboard

Method One: Copy Code code as follows: -(uiimage*) Scalefromimage: (uiimage*) Image scaledtosize: (cgsize) newsize { Cgsize imagesize = image.size; CGFloat width = imagesize.width; CGFloat height = imagesize.height; if (width

Objective A few days ago in doing some small functions, suddenly found that some basic data conversion have forgotten, so hurriedly sorted down to write down! To facilitate their own later inspection, but also to some friends need some reference,

This article mainly introduces the object pointer and the basic data type in iOS how to make a strong turn, the following words do not say more directly to see the example detailed. One, the object pointer's strong turn: UIView *view =

Recently learned several methods of delaying execution, share. 1.performSelector (NSObject) method 2.NSTimer method 3.GCD method 4.sleep (Nsthread) method Deferred code execution: -(void) Delaydo: (ID) Sender { NSLog (@ "do:%@",

Query time or long or short, in order to enhance the user experience, the current use of more than one of the means of query waiting to add a dynamic wait effect. We have an action effect when we load the page while requesting the network, and the

1. The size of pinyin is the smallest, and the declaration of POAPinyin is about 500 rows.2. The speed is almost the same, but do not use the convert of POAPinyin native. It is very slow to traverse and search every time.3. Compared with pinyin, you