IOS

When using UITableView, the height of UITableViewCell may change. There are two ways to change the Row Height: the first is to change the height of all rows. The second is to change the Row Height of a Specific Row. First, change the Row Height of

If the IOS App uses CoreData and has database updates (new tables, fields, and other operations) in the previous version, it is necessary to migrate the CoreData database when overwriting the installation program, the procedure is as follows: 1.

-(Void) viewDidLoad {// create a sliding gesture UISwipeGestureRecognizer * recognizer; recognizer = [[delealloc] initWithTarget: selfaction: @ selector (handleSwipeFrom :)]; // you can specify the sliding direction, the following example applies to

For details about NSJSONSerialization, the official documents include: You use the NSJSONSerialization class to convert JSON to Foundation objects and convert Foundation objects to JSON. an object that may be converted to JSON must have the

[Cpp] // obtain a subView UIView * view of a window = [[[[UIApplication sharedApplication] windows] objectAtIndex: 0] subviews] lastObject]; NSInteger index = 0; // name the saved png file for (UIView * subView in [view subviews]) {// traverse the

I. Calling System Applications 1. Calling the app store Interface Method in actual development, we often recommend other applications and their own paid software, then we need to directly connect to the corresponding page of the app store in the

# Include <>: Used to reference a system file. The compiler searches for the file in the system file directory. # Include "xx. h": Used to reference User-Defined files. The Compiler first searches in the user directory, then installs the directory,

1. Adapt to 4 inch screen adaptation. To adapt to the 4 inch screen, the system creates a default-568h@2x.png image and identifies whether the system supports the 4 inch screen based on the resource. As for other resources, xxx-568h.jpg is not

Tile navigation mode is an important navigation mode. It is generally used for simple flat information browsing or tasks. Flat information refers to the non-subordinate hierarchical relationship between the information, such as flattening

Use the story board technology to implement tag navigation. Use the "Tabbed Application" template to create a project named "TabNavigationStoryborad. Select "Use Storyborads" and "Use Automatic Reference Counting ". After the creation is complete,

After creating an instance of the UITableViewController subclass, the code generated by IDE contains the following section: [Cpp] view plaincopy-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *)

/** ** Determine whether the date is this week **/   -(BOOL) isCurrentWeek :( NSString *) dateStr { NSDateFormatter * dateFormatter = [[NSDateFormatteralloc] init]; [DateFormatter setDateFormat: @ "yyyy-MM-dd"]; NSDate * date = [dateFormatter

// Draw -(Void) addSecondZone :( UIView *) contentView // Button Image UIImage * selecticonNo = [UIImage imageNamed: SelecticonNo]; UIImage * selecticon = [UIImage imageNamed: Selecticon]; UIView * childSecondView; Childseconddview = [[UIView alloc]

Third-party Wait indicator. MBProgressHUD is a third-party Wait indicator framework. Below are the wait indicator styles provided by MBProgressHUD, which can be divided into two categories: Unknown End Time and known end time. In MBProgressHUD, you

UITableView saves memory by reusing cells. by specifying a reuseIdentifier for each cell, you can specify the cell type and when the cell gets out of the screen, allows restoring cells for reuse. different IDs are used for different types of cells,

The following code detects the shaking time:   CMMotionManager * _ motionManager = [[CMMotionManager alloc] init]; NSOperationQueue * _ operationQueue = [[NSOperationQueue alloc] init]; BOOL _ isShake; // whether it is shaking BOOL _ isOver = NO; //

>>>>>>>> Multithreading in iOS provides the following methods:1. performSelector (InBackground or MainThread)This method is convenient, but the problem is that parameter passing only supports one object (passing multiple parameters, I package them

Today, my new colleague asked me some questions about when to use global variables and when to use self. assignment. So I will explain it here. When to use self. most of the replies in the online search or forum are simply said that this is related

1 PrefaceThe last time we introduced the simple method of creating a Storyboard, this time we will introduce how to pass values between two viewcontrollers through Storyboard. 2. code example2.1 create a ViewController file without nib   2.2 set the

1 PrefaceGestures are actually a combination of touch events. gesture event recognition must be added to a UIView class. Multiple gesture identifiers can be added to a single view. Once some gesture actions are captured on this interface, this view