ipad ios 12 1

special instruction execution, which determines the efficiency of the stack is high.The heap is provided by the C + + function library, and its mechanism is very complex. 7. Memory management mechanism of Objective C8. Does iOS have garbage collection9, the reuse mechanism of UITableView10, when the Viewcontroller Loadview, Viewdidload, Viewdidunload, respectively, when the custom Viewcontroller in a few functions should do what work?11, How to under

an endless loop. 7,Write the output content of the following code # Include Printf ("B, c, d, A: % d, % d, % d", B, c, d, a); Return 0;} Answer: 120, 13 6. Is bool available in C without C ++? A: in C language, bool (Boolean) Type C ++ is not introduced. in C language, bool type C is used. The value 0 indicates false, and a non-0 integer indicates true (generally 1) 7. escape characters 9. Can global variables and local variables have the same nam

This paper mainly discusses the related content of quartz2d in question and answer form, and the reference content is the learning video material downloaded online.1. What is quartz2d? He is a two-dimensional drawing engine that supports both iOS and Mac systems 2, quartz2d can complete the workdraw basic lines, draw text, pictures, custom UIView.3, the value of quartz2d in the developmentwhen our control

IOS audio function development (1) sortingTo add audio to the project, first import the audio framework AVFoundation. framework Create a new class that inherits from UIViewController. I will name it FirstVC here.First, initialize the Root View in AppDelegate. m. 1 // 2 // AppDelegate. m 3 // YinPinShiPin 4 // 5 // Created by chulijian on 14-11-8. 6 // Copyright (

How to Implement iOS library animation-Part 1 (Part 2) Status 2-open a book Now that the animation of state 1 is complete, we can move it to the processing of state 2. Here we will convert a combined book into an opened book. Add the following method under setStartPositionForPush (_: toVC: func setEndPositionForPush(fromVC: BooksViewController, toVC: BookViewCo

Use of UIButton in ios development (I) I. Simple Description generally, after clicking a control, the corresponding response is that buttons have many functions, including displaying text and images, you can also adjust the positions of internal images and text at any time. 2. The enumerated constants corresponding to the normal (normal) status (Default): UIControlStateNormal highlighted (highlighted) when the button is pressed (the finger has not bee

", heightLabel.size.height);19, Uilabel according to the number of words automatically realize the height of adaptationUILabel *msglabel = [[UILabel alloc]initwithframe:cgrectmake (0, 0)];Msglabel.backgroundcolor = [Uicolor lighttextcolor];[Msglabel setnumberoflines:0];msglabel.linebreakmode = uilinebreakmodewordwrap;Msglabel.font = [Uifont fontwithname:@ "Arial" size:12];cgsize size = Cgsizemake (290, +);Msglabel.text = @ "Get the Devicetoken, we can

can be modified, but the pointer is not modifiable)4> last means: A is a constant pointer to a constant number (the integer number pointed to by the pointer is not modifiable and the pointer is not modifiable)12, the role of static?The 1> static modifier is an intrinsic function that can only be called in this file, and other files cannot be calledAll variables of the 2> static modifier are an internal var

IOS advanced development KVC (1) The Skillful Use of KVC can bring us great benefits in the development process. Especially when the json conversion model is used, KVC frees programmers from tedious and nutritious code accumulation. Reducing the amount of code is to reduce the probability of errors. KVC is flexible to use. This flexibility is based on strict naming requirements. This naming requirement is a

Ui update operations in IOS are actually the same as those in Android. They are not time-consuming operations in the main thread. Therefore, you need to enable new threads to perform these operations, to avoid blocking the main thread. After the operations in the new thread are completed, the main thread is called to update the UI. The following is an example: 1. Declare the imageview Control