IOS

ARC-Xcode detection cycle reference, and arc-xcode detection reference 1. Create a project on the desktop and enter the following code in ViewController. m:   - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading

Step by step teach you how to mount iOS apps Step 1: Download/create a certificate and assign it to a certificate. If yes, download it directly. If no, click the plus sign in the upper right corner to create a certificate. The specific new content

ARC-do not send messages to released objects. arc-release sends messages.   1. Write the following code in AppDelegate. m:   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //

Knowledge Point of NSSet and NSMutableSet in IOS collection, nssetnsmutableset   NSSet is not much different from NSArray in actual application, but if you want to find an element in NSArray, You need to traverse the entire array, which is

IOS --- solve the problem that all interfaces in RESideMenu can slide sideways RESideMenu is an easy-to-use slide layout class library in iOS. This type of Slide effect is used in many iOS projects. You can add menu view controllers on both left

KVO removes class coupling through KVO.I. Overview KVO, that is, Key-Value Observing, provides a mechanism. When the attribute of a specified object is modified, the object will receive a notification. In short, KVO automatically notifies the

-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) if the indexPath is not executed, uitableviewcell -(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *)

OC Syntax: KVC and KVO, ockvckvo 1. Key-Value Coding (KVC) KVC refers to NSKeyValueCoding, an informal Protocol that provides a mechanism to indirectly access object attributes. KVO is one of the key technologies based on KVC. An object has certain

[Learning notes] [OC language] inheritance, learning notes oc inheritance 1. Basic inheritance usage 1 # import 2/* 3 1. benefits of inheritance: 4 1> extracting repeated code 5 2> establishing a relationship between classes 6> subclass can have

Ios implements the shake Function You must have used the shake function ~ The ios SDK helped us complete all the work. We only need to add the corresponding logic. The following is the implementation code (Add the following code to the

IOS timestamp string NSdate conversion demo 1. In projects, we often need to convert the time format. The following is my encapsulated NSDate + TimeCategory, hoping to help you.     # Import @ Interface NSDate (TimeCategory)/*** convert string

Stop interaction in IOS-UIView UIView stop interaction (no focus ):Set userInteractionEnabled = NO to get the interaction settings YES.It can be applied to custom controls such as UIButton and UITextField. [editButton

IOS-Get UITextField input text When the UITextField text changes, update the data based on the content by writing the listening event.Add a listener: [TimesField addTarget: self action: @ selector (textFieldDidChange :) forControlEvents:

Differences between Copy and MutableCopy: copymutablecopy NSString * string = @ "origion"; NSString * stringCopy = [string copy]; NSMutableString * stringMCopy = [string mutableCopy]; [stringMCopy appendString :@"!! "]; Note the following points

UITableView simple performance optimization, uitableviewThe memory of iOS devices is limited. If you use UITableView to display thousands of data records, you need thousands of UITableViewCell objects, which consumes the memory of iOS devices. To

UICollectionView basics, uicollectionview UICollectionViewFlowLayout *flowLayout= [[UICollectionViewFlowLayout alloc] init];    flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;// Scroll direction    flowLayout.minimumLineSpacing

What is the possibility of a control invisible to the naked eye ?, Invisible to the naked eye 1. This control is not instantiated at all.2. No dimension is set.3. The color of the control is the same as the background color of the parent control

[Learning notes] [OC language] class method, learning notes oc Language 1. Basic ConceptsMethods that can be directly executed using class names (Classes occupy storage space in the memory, including the class \ object method List) 2. Comparison

IOS-event handling for controls responding to user control eventsNot all objects in iOS can process events. Only objects that inherit UIResponder can receive and process events. We call it "responder object". UIApplication, UIViewController, and

IOS system Message notificationI. keyboard1. UIKeyboardWillShowNotification-the keyboard to be displayed2. UIKeyboardDidShowNotification-display keyboard3. UIKeyboardWillHideNotification-to hide the keyboard4. UIKeyboardDidHideNotification-the