IOS

IOS uses Socket UDP protocol Broadcast Mechanism 1. Preface What is the UDP protocol broadcast mechanism? For example, if a person in a group of people is looking for James, then you yell (broadcast): "Who is James" If it is James, it will respond

IOS Touch ID and iostouchid 1. First import the header file #import 2. Key code -(Void) validateTouchID {LAContext * context = [[LAContext alloc] init]; NSError * error; NSString * tip = @ "verify existing mobile phone fingerprints by using the

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

Several Methods for IOS to cache images locally Caching images locally is used in many scenarios. If you only store text information, you can create a plist file or database to easily solve the problem, however, it would be less convenient to store

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 KVC (Key-Value Coding)Common usage: Getting valuesValueForKey: valueForKeyPath based on the property name:[Person valueForKeyPath: @ "car. price"]) ValueForUndefinedKey throws an exception by default. You can rewrite this function for error

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:

IOS-Purchase type view Custom purchase type view Code // Payment page format-(UIView *) CellForRowAtRow :( NSInteger) row {UIView * itemView = [UIView viewWithFrame: CGRectMake (0, 0, viewWidth ()-20, 45) andBkColor: [UIColor clearColor]; NIDASSERT

Download MonoTouch and monotouch Application tried to present modally an active controller 1. AddGestureRecognizer adds an event to the image View // Rounded Avatar _ avatarView = new UIImageView (new RectangleF (_ blockSpace, _ blockSpace, 2 * _

19th-day notes (Protocol-protocol) and IOS-Protocol Knowledge points of IOS Learning (oc language) 1. Introduction to Protocols1) concept: a protocol refers to an interface object negotiated between multiple objects. The Protocol provides some

Common shortcuts in Xcode Various new Shift + comand + n create an xcode Project Option + command + n create Group Command + n create a file Search Shift + command + o Command + f Control tabCommand + t create a tab Command + w close tab Hide

Two Methods for capturing video thumbnails in iOS After you have finished playing an online video using MPMoviePlayerController, you may need to obtain a thumbnail of the video in practice. Let's take a look at how to take a thumbnail of the video

IOS-use CoreLocation to get the current city In the previous blog-CoreLocation-iOS location information, we briefly described the use of CoreLocation and obtained latitude and longitude information. next, we will reverse parse the current city and

Simple use of multithreading and simple use of Multithreading Simple use of NSOperationQueue: 1. Create an NSOperationQueue object 2. Create an NSOperation object 3. Add operation to NSOperationQueue MRC needs to be manually released 4. release

Xcode installation Cocos2d-iphone, cocos2d-iphone 1. Cocos2d: http://www.cocos2d-iphone.org, then go to the Download page 2. decompress the downloaded package in the mac system. It is best not to put it on the desktop. I put it in Documents. 3.

IOS development-UI from entry to entry (1), ios-ui I. UI Overview (1) UI (User Interface) User Interface, various page elements that users can see; (2) iOS App = Various UI controls + business logic and algorithms; (3) to develop an exquisite

IOS stage study 13th days notes (polymorphism), ios 13th days Knowledge points of IOS Learning (oc language) I. Polymorphism 1) popular understanding of polymorphism, that is, multiple forms of a method. 2) compatibility with polymorphism

IOS stage learning 15th-day notes (NSArray and NSMutableArray arrays), iosnsarray sorting Knowledge points of IOS Learning (oc language) 1. array in OC1) array: it is also an object. The address of the object is stored in the array, and the address

NSLayoutConstraint basics for Automatic Layout of IOS pagesBefore using AutoLayout, you need to know the following two points: 1. You must set translatesAutoresizingMaskIntoConstraints to NO. 2. For viewControl, AutoLayout adaptation is written in [-

IOS control UITextView achieves placeholder effect and solves UITableView keyboard occlusion At ordinary times, there are always multiple lines of text in development, and there must be a placeholder prompt. You can organize some code in the project