Mobile Develop

Problems with null pointers are often encountered in iOS development.such as JSON data sent back from the background, the program does not infer the direct assignment operation, it is very likely that a crash flashback.To solve the problem of NULL

+ What are people most inseparable from this century? No doubt it's the phone! And what's the most fascinating thing about mobile phones? The answer is all kinds of app apps, whether it's a crazy hand tour for countless people-the glory of the Kings,

The viewport view of the META tag is essential when writing a mobile-side project:This code is added so that the width of the page can be equal to the width of the screen, and the initial scale of the display is added to the mobile side, the maximum

First step: Add JS$ (function () { var ua = Window.navigator.userAgent.toLowerCase (); // if (Ua.match (/micromessenger/i) = = ' Micromessenger ') {Browser binding Events /*$ (". App"). Bind (' click ', Function (event) {

Requirements Description:There are two viewcontroller we remember to do A, B, where B controller only shows the lower part;As the effect:There are many ways to implement this, you can add a view method, or you can use Uiwindows to implement.But my

Appium Environment Construction has been written in the blogThen this blog mainly introduces the Java version of the Appium starter demo. Before starting the demo, the Android emulator to install, in fact, the simulator is the simulator real machine,

# 1. Drawer controlSlidingdrawer: Be sure to configure Android:handle (handles) and android:content (content), and add the layout of the handles and content in the child view"' JavaAndroid:layout_width= "Match_parent"android:layout_height=

WCUserInfo.h#import#import "Singleton.h"@interfaceWcuserinfo:nsobjectsingleton_interface (Wcuserinfo); @property (nonatomic, copy) NSString*user;//User name@property (nonatomic, copy) NSString *pwd;//Password/** * Login status YES login/no

Singleton.h//. h#defineSingleton_interface (Class) + (Instancetype) shared# #class;//. M#defineSingleton_implementation (Class)Static class*_instance;+ (ID) Allocwithzone: (struct_nszone *) Zone {Staticdispatch_once_t Oncetoken; Dispatch_once

First, add permissions to the Androidmainfest.xml file: Then add to the activity such as the following code:Private String Getconnectwifissid () { Wifimanager Wifimanager = (wifimanager) getsystemservice (wifi_service); Wifiinfo wifiinfo =

In today's blog, we will implement some of the commonly used categories of information in the category selection of the control package. This blog does not use any new technical points, if it is necessary to say what new technical points, then

#import extern double Add (double x,double y), extern double subtract (double x,double y); extern double multiply (double x,double y), extern double divide (double x,double y);#import #import "MathOperation.h" BOOL isanoperator (const char value)

4 Writing the HAL codeSource code Download methodFirst time:git clone https://github.com/weidongshan/SYS_0001_LEDDemo.gitUpdate:Git pull originRemove the specified version:git checkout v1//have JNI without HALGit checkout v2//have Jni,halgit

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MV (move) in the format " mv "Options" "Source Files" "Destination Files" ". ( can not only move files, but also to move the directory )- I. : asks if the user wants to overwrite when the target file is present. In the Redhat/centos system, the MV

File operation Android Data storage method Sharedpreferences Storage File storage SQLite database Storage ContentProvider Storage Networked storage Resource File storage Directory Res/xml The custom

1, afnetworking Lightweight Communication class library, the use is very simple. : Https://github.com/AFNetworking/AFNetworking2, Fmdbfmdb is a database management library that encapsulates SQLite-related SQL statements and simplifies database

In the actual development, the status bar sometimes, we need to set ourselves;Like what:Default status barIf the view we developed is black, then the effectThe status bar is black on the white background, the following view is black bottom?Is this

" Singleton mode " is one of the most common design patterns I use in iOS. The singleton mode does not need to pass any parameters, it effectively solves the problem of data sharing between different code. Singleton classes are a very important

1:#import typedef void (^configurecellblock) (id cell, ID item);//slimming viewcontroller@interface rrfriendtableviewdatasource:nsobject-(ID) initwithitems: (nsarray *) items cellitentifier: (nsstring *) cellidentify configurecellblock: (