IOS

[IOS development] changing the pixel value of UIImage -(UIImage *) imageBlackToTransparent :( UIImage *) image {// allocate memory const int imageWidth = image. size. width; const int imageHeight = image. size. height; size_t bytesPerRow =

Use of WebView for iOS Learning 1. initialize WebView -(Void) viewDidLoad{[Super viewDidLoad];WebView = [[UIWebView alloc] initWithFrame: CGRectMake (0, 0,320,480)];NSURLRequest * request = [NSURLRequest requestWithURL: [NSURL URLWithString: @ http:/

IOS network data download and JSON parsing, and ios data json ParsingIntroduction to IOS network data download and JSON Parsing In this article, I will introduce how to use URLConnection to download data from the network, parse the downloaded JSON

IOS multithreading summary, ios Multithreading1. Do not open too many threads at the same time (1 ~ 3 threads, no more than 5) 2. thread Concept 1> main thread: UI thread, display and refresh UI interface, process UI control events 2> sub-thread:

XML parsing for iOS development and iosxml ParsingXML parsing in iOS development 1. XML format Structure: layered nested Tree Structure 1.0 indicates the XML file version, and UTF-8 indicates the encoding used by the internal text indicates the

Develop a line of code series for iOS: Get the database in one linePrinciple Relationship between iOS and SQL Model class structure => SQL table structure Model instance => a row in the SQL table Attribute of the Model instance => a column in the

Common iOS algorithms (Binary bubble selection)Bipartite: Average time complexity: O (log2n) int halfFuntion (int a [], int length, int number) {int start = 0; int end = length-1; int index = 0; while (start Bubble Sorting: /** Average time

Custom induction of iOS keyboard types Sometimes we cannot display the mobile phone and keyboard on the Xcode virtual machine, because we have not set the keyboard correctly: You can do this: Make sure that the third box is also marked with a pair

Ios string judgment 1. scope: [plain] view plaincopy typedef struct _ nsange {unsigned int location; unsigned int length;} nsange; // location indicates the starting position where the field stores the range, and length indicates the number of

Explanation of nil, Nil, NULL, and NSNull in iOS, nilnsnullNil Nil is the literal null value of the ObjC object, corresponding to the id type object, or the ObjC object declared by @ interface. For example:NSString *someString = nil;NSURL

Assign attribute must be unsafeunretained During the use of the Protocol today   @ Interface AppDelegate () {id Testdelegate;} @ property (nonatomic, assign) id Testdelegate; @ end @ implementation AppDelegate @ synthesize

Ios network data download and JSON parsing, and ios data json Parsing Ios network data download and JSON Parsing Introduction In this article, I will introduce how to use NSURLConnection to download data from the network, parse the downloaded JSON

IOS Development notes-Implementation of UILabel mixed with any font and colorThe simplest way is to use multiple UILabel to arrange and display, but this is not only troublesome but also ineffective, and the custom UILabel is as flexible as possible.

IOS message mechanism1. Local push IOS push notifications can be divided into local push and remote push notifications. Remote push notifications are similar to messages sent to us by friends even when we lock the screen, then an alertview is

IOS gets the day after the current time-(Void) time {NSDate * now = [NSDate date];NSCalendar * cal = [NSCalendar currentCalendar];Unsigned int time = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour |

Dynamically set the Cell height for ios -(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) indexPath { Self. mainTitle = [[UILabel alloc] init];Self. mainTitle. numberOfLines = 0;Self. mainTitle. font =

Encapsulation of iOS-binary Protocol   Encapsulation of iOS-binary Protocol     For SDK socket communication, there will be a binary communication mode. Based on the previous work content, we will summarize: First, we can use the string and binary

IOS. UI advanced. UITouch touch and UIGesture gesture. 01. Events, touch events, ios. uiuigesture I. iOS events: 1. event: When you click a cell phone screen on your cell phone, slide your cell phone, and shake your cell phone, the mobile phone

IOS NSOperation non-concurrent execution, iosnsoperationNSOperation provides an object-oriented method to encapsulate tasks. NSOperation can be executed independently or in NSOperationQueue. NSOperation is a virtual base class that cannot be used

Xcode6 + ios8 latest real machine debugging tutorial, xcode6ios8 Introduction: As we all know, Apple's security has always been very high, leading to a much higher barrier for ios development than Android, which has led to the fact that senior iOS