When calculating the view relative coordinates Convertpoint:toview:, uiapplication Sharedapplication-keywindow is nil?

UIWindow *window = [UIApplication Sharedapplication].keywindow;Window is nil because the window was not visualized prior to specifying Rootviewcontroller1. Exampleto nil:Self.window = [[UIWindow alloc] Initwithframe:[uiscreen

Android Calculator page

Android:layout_width= "Match_parent"Android:layout_height= "Match_parent" > Android:layout_height= "Wrap_content"Android:layout_weight= "1"android:gravity= "Right|bottom"/> Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text=

Android uses spinner to implement a drop-down list

Course Objectives1. Understand the use and functionality of the spinner drop-down list2. Learn to use the system default spinner3. Learn to use custom style spinnerPerform stepsFirst step: Add a list of drop-down list items, and the items you add

Callback for IOS block

//Student.h#import@interfaceStudent:nsobject- (void) Playbeforeexam: (void(^) (nsstring*)) Takingmakeupexam Punish: (void(^) (void)) Completionhandler;@end//STUDENT.M#import "Student.h"@implementationStudent- (void) Playbeforeexam: (void(^)

Error grooming in iOS development, communication exercises between threads, errors in the practice of loading Pictures-HTTP request errors

Console printing: Application Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app ' s info.plist file.The program prohibits HTTP plaintext access and the

Android Review notes--intent

Intent is an important way to jump through components in Android, and is generally pathetic for scenarios such as initiating activities, starting services, and sending broadcasts.#显示IntentPrimarily used to start a known componentSending partyIntent

Location near iOS search (similar to Weibo's circle of Friends location)

Say everything is pale, direct ~In some cases, we need to get the location of the user's perimeter to let the user choose. For example, in a circle of friends, you can choose a location when sending a circle of friends, or use this function.Based on

Keymob Mobile Ad aggregation platform-focus on mobile app AD management platform

Keymob Mobile ad aggregation platformis aDomesticthe leadingMobile Ads, intelligentMovingAdvertisingAggregationPlatform, forAdvertising ownerand application developers to provide optimal advertising products and services to create the best revenue.

iOS alassetslibrary simple to use

There are two aspects to the simple use of alassetslibrary:First: The image/Video method is stored as follows://With a UIImage, the API user can use-[uiimage Cgimage] to get a cgimageref, and cast-[uiimage imageorientation] t o

Android system porting and driver development experience

What is Android?It is an excellent, free, open-source embedded operating system that anyone can use to customize their own embedded systems using Android's source code. In short, Android is a Linux-based open-source mobile operating system developed

How to apply for an iOS job

Source Address: Http://www.raywenderlich.com/53628/how-to-apply-for-an-ios-developer-jobPrepare ResumeHow to prepare your CV1. Good resume: Concise, professional, clear representation of your ability2. A good cover letter: Reflect your job search

iOS Performance optimizations

Instruments has recently been used to analyze the performance of the entire application. Discover a lot of interesting points, as well as performance optimizations and some techniques for analyzing performance consumption. Summary below.Instruments

Use reveal to analyze view layouts for other apps

Use reveal to analyze view layouts for other appsWe may sometimes not know how to layout the view, this time we would like to refer to similar other app interface layout, then we can use reveal for layout analysis.(a) Jailbreak installs OpenSSH and

Keymob Aggregation-A powerful one-stop mobile ad aggregation platform

Keymob Mobile advertising converged platform has always adhered to service first, good reputation, focus on mobile marketing, providing advertising aggregation, advertising management, revenue optimization services, developers embedded in the best

Android custom Alertdialog (section)

Java:Final Alertdialog Dialog =NewAlertdialog.builder (mcontext). Create (); Dialog.setcancelable (false); Dialog.show (); Dialog.getwindow (). Setcontentview (R.layout.enable_gps_dialog); Button Unagree_dialog=(

Android handler to prevent memory overflow

Time: April 20, 2016 14:21:49 static class MyHandler extends Handler { private WeakReferenceContext> weakReference; public MyHandler(Context context) { weakReference = new WeakReference<>(context);

No response using Notifaction in Android

Time: 2016-4-20-11:07:29No response when using Notifaction.builder (), do you want to set icons icon? builder.setSmallIcon(R.drawable.ic_launcher); If the icon is not set, there will be no response when the trigger occurs.Full code

Android Instance-get Program version number

Related information: 383675978 Group numberExample Source:1 UnitUnit1;2 3 Interface4 5 uses6 system.sysutils, system.types, system.uitypes, system.classes, system.variants,7 FMX. Types, FMX. Controls, FMX. Forms, FMX. Graphics, FMX. Dialogs,8 FMX.

Cocos2d-Lua02Lua object-oriented

Cocos2d-Lua02Lua object-oriented1 object-oriented 1.1 in Lua Lua is not an object-oriented language, but he has an object-oriented idea. In lua, the object orientation is pseudo-object-oriented, and the object orientation must be table-based. A

Construction and basic concepts of cocos2d-Lua03 Environment

Construction and basic concepts of cocos2d-Lua03 Environment   Push: Director (Director ): Is a Singleton, the main work is: 1. initialize and destroy the game at the beginning and end of the game; 2. switch the game scenario and control the

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