uiapplication

Before we get to the app window, we usually do this:[UIApplication sharedApplication].keyWindowThis writing has always been felt right, no problem, and most of the online blog or material is also written, but recently in the project, found that this is not safe to write, if the application does not jump, this kind of writing is feasible, but if the application has a jump (share jump to other apps, Access to the System album, etc.), then return to the

All mobile operating systems have a fatal disadvantage: apps are vulnerable to interruptions. For example, a call or lock screen will cause the app to enter the background or even be terminated there are many other similar situations that can cause the app to be disturbed, and when the app is disturbed, there will be some system events, UIApplication will notify its delegate object, Let the delegate agent handle these system events? The delegate can h

Crash ReasonCrashAssertionfailurein-[UIApplication_runWithMainScene:transitionContext:completion:],/BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-(* * * * terminating app due to uncaught exception ' nsinternalinconsistencyexception ', ' Enter code here ' reason: ' Application W Indows is expected to has a rootviewcontrollerattheendofapplicationlaunch‘First throw call stack:)Try solution one:The code makes adjustments, joins the next loop cycle, runs the code again, and the progr

A copy of an item runs an error: 2017-03-07 14:44:57.906 zenithcp[54472:2455909] * * * assertion failure in-[uiapplication _runWithMainScene: Transitioncontext:completion:],/buildroot/library/caches/com.apple.xbs/sources/uikit_sim/uikit-3600.5.2/ uiapplication.m:3679 Error Reason: -(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (nsdictionary *) launchOptions{ Self.win

PreferredcontentsizecategoryUikit_extern nsstring *const uicontentsizecategorydidchangenotification Ns_available_ios (7_0); UserInfo dictionary would contain new value for UicontentsizecategorynewvaluekeyUikit_extern nsstring *const uicontentsizecategorynewvaluekey Ns_available_ios (7_0); NSString instance with new content size category in UserInfoThis notification was posted after the user takes a screenshot (for example by pressing both the home and lock screen bu ttons)//After this notificat

UIApplication/UIScreen/UIDevice平常用的很少；但毕竟是属于UIKit的重要组成部分，有必要了解一下。UideviceYou can obtain a singleton that describes the current device through UIDEVICE. You can get information about device name, device model, operating system name, and version of

Main. m is the entry to iPhone program execution. A typical main. M file is as follows: #import #import "AppDelegate.h"int main(int argc, char *argv[]) { @autoreleasepool { return UIApplicationMain(argc, argv, nil,

first,uiapplication 1. Brief Introduction(1) uiapplication An object is a symbol of an application, and a UIApplication object represents an Application. (2) each application has its own uiapplication object, and is a singleton, if you try to create

iOS Development UI Chapter-program Startup principle and UIApplicationfirst,uiapplication 1. Brief Introduction(1) the UIApplication object is a symbol of the application, and a UIApplication object represents an Application.(2) each application has

Program Startup principle and UIApplicationFirst, UIApplication1. Brief introduction(1) The UIApplication object is a symbol of the application, and a UIApplication object represents an application. (2) Each application has its own UIApplication object, and is a single example, if you try to create a new UIApplication