Mobile Develop

KVO = = Key Value ObservingFunction: Can listen to the change of an object's propertiesFirst, the use of KVO New ]; @" Chg " ; ; // add a listener to the P object to listen for changes to the Age property of the P object, as long as

1. Download and install Android Studio (see "Android Studio installation and Environment Configuration notes")2. The runtime's welcome interface is as follows:3. When the boot is complete, it is a boot page, you can create a new project, you can

The template method allow separate the generic method from a detail context (class) via inheritanceAnother advantage:1.Inheritance implementation means that's you'll know the actual method implementation class before Compilation,it is very Big

Either way, you must make a macro definition in the PCH fileDebug and release to separate, release when log print to cancelMethod One: Simple and straightforward, with a few lines of code, concise but less functional#ifdef DEBUG #define NSLog (...)

File This is the base class of files, which represent a file entity abstractly, and it has four different construction methods:File (file dir, String name)File (String Path)File (String Dirpath, string name)File (URI Uri)The essence of these

var browser = {Versions:function () {var u = navigator.useragent, app = Navigator.appversion;return {//Mobile terminal browser version informationTrident:u.indexof (' Trident ') >-1,//ie corePresto:u.indexof (' presto ') >-1,//opera

ImageView has the ScaleType property to scale the picture so that it fills the width of the screen, but compression or clipping occurs. The properties of the ImageView ScaleType are matrix (default), center, Centercrop, Centerinside, Fitcenter,

Someone asked, under the arc, Iboutlets should be defined as strong or weak? The answer is supported by the largest number of people, with only one excerpt from an official document:from A practical perspective, in IOS and OS X outlets should is

ObjectiveWhen we test the application sometimes need to delete the database files, on the real machine need root permission is not very good, but in the simulation machine is relatively simple, can be deleted directly, but the first time do not know

CardView is a component that is placed in the Support Library V7 package (Recyclerview is also here, which is explained in detail in the blog behind)At the beginning of writing Recyclerview's demo, found that others are written out of the card-type

Source: http://www.hackbase.com/tech/2014-12-26/70203.htmlIn iOS development, it is necessary to do test processing for different network conditions. But I find that there are still some iOS developers who are not very aware of debugging problems in

#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)

////main.m//inherit////#import #import "Animal.h" #import "Cat.h" #import "Dog.h" #import "FeedMan.h" int main (int argc, const char * argv[]) {//Animal * Animal = [Animal new]; [Animal eat];////[Animal sleep]; Forgot to introduce

main.m// a+b//#import #import "Calcultor.h" int main (int argc, const char * argv[]) { calcultor * cal = [[Calcultor alloc]init]; [Cal Seta:10]; [Cal Setb:20]; int result = [cal add]; NSLog (@ "%d", result); NSLog (@ "

Asynctask executes four steps and executes four methods:1.onPreExecute (), running on the UI thread, can set or modify UI controls, such as displaying a progress bar2.doInBackground, running in a background thread, can not set or modify UI controls,

Xcode6 in Apple positioning method change map, no one can useError description: Trying to start mapkit location updates without prompting for location authorization. Must call-[cllocationmanager requestwheninuseauthorization] or-[cllocationmanager

Permissions: android:name="android.permission.INTERNET" /> android:name = "android.permission.ACCESS_NETWORK_STATE"/> Used to determine and turn on network settingspublic class Netcheckwebserver {Public Netcheckwebserver () {} public

Needs 1. Implementing the Timeline Effect 2. The data shows the top of the old data, the bottom is the latest data (speaking a little anti-normal iOS logic, but this is the demand, resigned to it ~) 3. When you enter the page, scroll directly to the

Cocos2dx 2.x Android gravity detection Rotating Screen In the case of charging, when playing with a mobile phone, the screen usually needs a specific rotation direction. The function is divided into two parts: one is to obtain the desired Angle

Cocos2dx image loading // Data: Image file data dataLen: file length bool Image: initWithImageData (const unsigned char * data, ssize_t dataLen) {bool ret = false; do {CC_BREAK_IF (! Data | dataLen (Data), dataLen, & unpackedData);} else