IOS

1. Virtual MemoryIPhone OS does not write volatile memory (such as application data) to swap files, so the amount of memory available for applications will be more limited. Cocoa Touch provides a built-in mechanism to notify applications of

With the development of technology, more and more mobile phone systems are equipped with multi-core processors. If you want to take advantage of its multi-core advantages in these systems to make your program run faster, you will inevitably need to

Core Data is a powerful layer located on the SQLite database. It avoids SQL complexity and allows us to interact with the database in a more natural way. Core Data converts database rows to OC objects (Managed Objects) so that they can be operated

========================================================== ================================When creating an image wallpaper application, you need to hide the tab and navigation bar at the bottom of the wallpaper. These systems are all animated. Then,

In ios, Apple has encapsulated a class and opened the corresponding IPA. The corresponding class is NSFileManager and the file management class. Instantiation: [Plain]NSFileManager * manage = [NSFileManager defaultManager]; NSFileManager * manage = [

1. Common NSFileManager file Methods -(NSData *) contentsAtPath: path // read data from a file -(BOOL) createFileAtPath: path contents :( NSData *) data attributes: attr // write data to a file -(BOOL) removeItemAtPath: path error: err // delete an

1000memories has open-source its iOS waterfall stream View Control "quilt" under the MIT protocol ". Quilt-display images and media in multiple columns with different aspect ratios is the core of ShoeBox Design Aesthetics for 1000memories websites,

1 PrefaceI have also introduced GCD before, but I feel that it is not deep enough. Today I want to re-understand this concept. GCD is the Grand Central Dispatch) o ). One of its important concepts is queue. The system provides many predefined queues,

This is a requirement in the project. to display an overview of a book, two rows are displayed by default. Click the expand button to show all, and click reclaim. Two rows are displayed.   At the beginning, a code like this may be written in the

1. What is a Singleton?Speaking of Singleton, I think of my java. I can't help but sigh that I have been studying java for four years. Now I have abandoned my java, it has entered the ranks of iOS.Forget it. on the right track, I am now the young

During the development process, we sometimes leave bugs. When users use our apps, sometimes there will be a crash. At this time, we can ask users to send us emails, in this way, our developers can quickly locate bugs, solve them as quickly as

First, add the database question: Select Build Phases-> Link Binary With Libraries point + Add Library      Then command + shift + k to clear the garbage from the history debug Copying other project files compilation errors:   [Cpp]When copying a

Today, we have encountered a problem of uploading user portraits. We need to read images from the album or camera. The code is simple. Extract the key parts as follows:   /Load user image-(void) Detail {UIActionSheet * sheet; // determine whether

Demo function: ios randomly selects a demo in a certain range, such as screenshots. When you click a button, the program will randomly select an option based on the range of button options. Iphone 6.1 passed the test. Demo Description: MainView. m

At the beginning of iOS development, the understanding of protocol and delegate has always been dizzy, and I don't know how to transmit values between two uiviewcontrollers. After interviewing several shoes and asking how to use delegate to pass

  1. Is the screen resolution of iPhone 5 1136*640? Screen Resolution: a parameter used to measure the amount of data in a bitmap image. It is usually expressed as ppi (pixels per inch ). The physical size of the screen remains unchanged. The higher

        Activity Monitor faithfully reflects the real-time changes in memory occupied by the program. However, in this mode, I don't think I can see the logs printed on the console. In short, there is no problem with the above method of viewing

  Problem description] In some cases, the field returned by the server contains spaces. This space is accidentally knocked out by the server developer, but the client needs to protect it, therefore, the client needs to filter out spaces in the

  A singleton instance refers to an instance with static allocation, and all instances in the iphone sdk, such [UIApplication sharedApplication] returns a pointer to a singleton object that represents the application. [UIDevice currentDevice]

For (UIViewController * controller in self. navigationController. viewControllers ){If ([controller isKindOfClass: [OverWorkRecevice class]) {OverWorkRecevice * owr = (OverWorkRecevice *) controller;[Self. navigationControllerpopToViewController: