IOS

Processing of memory warnings in iOS // Release the memory that is not currently in use, which is used by the current program. -(Void) didReceiveMemoryWarning { [SuperdidReceiveMemoryWarning]; // Dispose of any resources that can be recreated.

TabBarItem & NavigationBarItem, iostabbaritem for IOS development I think everyone has used it. How is page switching made? Next, we use storyboard and code to simulate the view control mode. "To do this, you must first sharpen the tool." The

The iOS double type is unstable and the solution is as follows !, Iosdouble   The current app has appeared. We will share some of the above-mentioned image bugs and try to solve them and pay attention to them!             Code with the problem:    

Functions and objects, function objects Example: Write a car class   // Declare the class @ Interface Car: NSObject { Int _ speed; // speed Int _ wheel; // wheel } -(Void) run; @ End   // Class implementation @ Implementation Car -(Void) run { NSLog

Description and Implementation of the OC class, write errors that are easy to make, and oc statement The statements and implementations of the oc class are as follows: 1. Write declaration only, not implementation 2. I forgot the end mark @ end. 3.

IOSApplication create Empty project custom UIButton, iosuibutton I recently started to learn about IOS. I cannot set many attributes of the control in the default Storyboard generated in Xcode5, so I tried to hand-Write the button in an empty

IAP Best Practices This document is Apple's new Technical Note -- In-App Purchase Best Practices released In August 5. It describes IAP Best Practices In iOS and OS X applications. The following is a list of IAP best practices recommended to

IOS Crash information capture tool The ios sdk provides a ready-made function NSSetUncaughtExceptionHandler for exception handling. However, the function is very limited, and most causes of crash include memory access errors and repeated release

IOS summary_simplified syntax for IOS development The following simplified method is the new method after IOS6.0 NSNumber // Simplify the preceding statement: NSNumber * value1; Value1 = [NSNumbernumberWithInt: 12345]; Value1 =

Drawing a curve chart for ios -(Void) drawLine {// view is the curve background view UIView * view = [[UIView alloc] initWithFrame: CGRectMake (10, 0,300,300)]; view. backgroundColor = [UIColor whiteColor]; [self. view addSubview: view]; // first,

Ios7 _ How to Implement UIAlertView and listen to click events, ios7uialertview 1. In the viewController. m file, follow the proxy Protocol @ Interface moboViewController () 2. Implement UIAlertView in the-(void) viewDidLoad Method 1-(void)

IOS image processing-cropping Images Solution:Based on the ratio of a certain length to width, the upper and lower parts of the image are cropped to retain the content in the middle. You can also customize the area to be cropped. Prerequisites:You

IOS image processing-fuzzy images Solution:Blur an image Prerequisites:Add CoreGraphics. framework Source code: - (UIImage*) blur:(UIImage*)theImage{ // create our blurred image CIContext *context = [CIContext contextWithOptions:nil];

Set navigation bar properties for ios weibo the next day and add the plus sign button Key points: 1. Add the plus button at the bottom. 2. Set navigation bar properties. 1. Four buttons at the bottom of the weibo button are the same, and the plus

Obtain UUID from iOS7 and convert MD5 Recently developed in the project, it is used to obtain UUID to MD5, but iOS7 cannot use the obtained UDID interface (involving privacy). The interface for obtaining MAC addresses is also discarded under iOS7.

IOS-dispatch_semaphore and NSOperationQueue concurrency, nsoperationqueue Concurrency: Run multiple tasks at the same time. It is also called "colopicity", which refers to the ability to process multiple synchronous activities. Parallel: Two

Why ios cannot obtain deviceToken The deviceToken cannot be obtained in the following method, -(Void) application :( UIApplication *) application didRegisterForRemoteNotificationsWithDeviceToken :( NSData *) deviceToken {NSLog (@ "deviceToken: % @"

IOS_21 group_ipad neutron controller screen adaptation Finally: Important screen adaptation techniques in iPad, Add a contentView placeholder first, And only set the frame in the viewDidLoad method, Because no matter whether the horizontal

How to keep the socket persistent connection and data transmission in the iOS background In the project, tcp persistent connections are used to transmit data to the server. On the IOS platform, due to Apple's background mechanism, the following

IOS_21 basic use of group_uicollectionview Finally: Code snippet: DealListController inherits from UICollectionViewController Self. view already contains a UICollectionView And the data source and proxy are already the current controller self