Objective-C basics 1: class inheritance and combination in OC, objective-coc

Objective-C basics 1: class inheritance and combination in OC, objective-coc 1. Class Definition and Declaration The class declaration in OC ends with @ interface and @ end. The class definition in OC starts with @ implementation and ends with @ end.

"IOS development" "OC" 00, ios "oc 」

"IOS development" "OC" 00, ios "oc 」   1. OC Introduction On the basis of the C language, a minimum object-oriented syntax is added. It is fully compatible with C language. It can be mixed into C language code or even C ++ code in OC code; you can

IOS Xcode: linker command failed with exit code 1 (use, xcodelinker

IOS Xcode: linker command failed with exit code 1 (use, xcodelinker I just transferred to iOS for development, but it is still difficult to draw complex interfaces. Let's not talk much about it...   Today, we have another problem with "linker

Third-party database used by databases FMDB and third-party fmdb

Third-party database used by databases FMDB and third-party fmdb Download FMDB   1. introduce the sqlite3 toolbox and introduce header files in the class for database operations: because third-party software also uses the sqlite toolbox to operate

Processing of null array judgment in iOS development

Processing of null array judgment in iOS development This article focuses on the issues that need attention when NSArray determines whether it is null. When determining whether the array is null, some developers write it:   if (array !=

Use NSURLSession and NSURLConnection to obtain the MIMEType and nsurl of the file.

Use NSURLSession and NSURLConnection to obtain the MIMEType and nsurl of the file. Both NSURLSession and NSURLConnection are Apple's built-in classes for network requests. NSURLSession was launched after iOS 7.0 to replace NSURLConnection. The

Ios album operation ALAssetsLibrary

Ios album operation ALAssetsLibrary 1. The ALAssetsLibrary instance provides us with the function of getting pictures and videos in an album (photo app. In ios8 photos framework, ALAssetsLibrary is replaced. When using ALAssetsLibrary, We need to

Common Xcode shortcuts and xcode shortcuts

Common Xcode shortcuts and xcode shortcuts Because mac is used for the first time, all the shortcut keys on mac are in the form of symbols, which cannot be remembered. The record is as follows. The correspondence between the symbol root keys on mac

IOS development tips-regular verification of ID cards

IOS development tips-regular verification of ID cardsNote: ID card verification may be required in many places during ios project development. Generally, during development, many people directly go to Baidu to change the related regular expressions

IOS uses storyboard to pass the value prepareForSegue: sender: Method to jump to the use of multiple page identifier, ios developed storyboard

IOS uses storyboard to pass the value prepareForSegue: sender: Method to jump to the use of multiple page identifier, ios developed storyboard The use of storyboard is complicated sometimes .... the value passing method is relatively simple .. it

[IOS UI advanced, iosui advanced

[IOS UI advanced, iosui advanced1. UIView transition Animation   1 // 2 // ViewController. m 3 // UIViewAnimationTest 4 // 5 // Created by hellovoidworld on 15/1/16. 6 // Copyright (c) 2015 hellovoidworld. all rights reserved. 7 // 8 9 # import

UIScreen and ios8UIScreen in ios8

UIScreen and ios8UIScreen in ios8Java code Let orientation: UIInterfaceOrientation = UIApplication. sharedApplication (). statusBarOrientation Println ("Currently landscape:" + (orientation = UIInterfaceOrientation. LandscapeLeft | orientation =

Ios-page value transfer (protocol, Singleton)

Ios-page value transfer (protocol, Singleton) Define a protocol on the first page and define a protocol method to obtain the return value from the second page to the first page. # Import # Pragma mark defines a protocol for parameter transfer@

Pie-it takes you to crawl the RSA pitfall that have been crawled for years, iOS RAS encryption and communication problems with. NET, rsaios

Pie-it takes you to crawl the RSA pitfall that have been crawled for years, iOS RAS encryption and communication problems with. NET, rsaiosBackground First of all, we are working on an APP recently, but our data interaction is in plain text =-=.

Shows user location cannot be located using a map on ios8.

Shows user location cannot be located using a map on ios8. In xcode6, the positioning method of the apple map has been modified, and it used to be unavailable. Error Description: Trying to start MapKit location updates without prompting for location

Listener network connection for iOS development, change, and disconnect

Listener network connection for iOS development, change, and disconnect During iOS development, we need to monitor/monitor network conditions. Apple provides Reachability. h and Reachability. m. Import Reachability. h You can write the following in

[IOS] Implementation of Crash collection similar to LeanCloud

[IOS] Implementation of Crash collection similar to LeanCloud Crashlytics is used to collect Crash, which is powerful and collects various Crash data and sends emails to developers in real time. For details, see Tang qiaoyi's article There are many

Login verification for ios

Login verification for ios We can use the third framework AFNetworking to communicate with the server using its post method. If the userId returned by the server is 10, the operation succeeds. If the returned userId is 11, the user name or password

IOS custom control progressView (ring progress bar)

IOS custom control progressView (ring progress bar) When I was working on a project, I used a ring progress bar. First I found a third-party control on the Internet and found that it is easy to use, that is, there are too many things and it is a bit

New ios positioning function-implement positioning in programs

New ios positioning function-implement positioning in programs Core Location is a framework in iOS SDK that provides device locations. You can use three techniques to obtain the location: GPS, cellular, or Wi-Fi. Among these technologies, GPS is the

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