IOS

Category, categories CategoryWhen I encapsulate a class and don't want to modify it any more, but as the program function increases, we need to add a new method to that class. This is just to add a category of this class) you can.Note: The category

Filters and regular expressions (NSPredicate, NSRegularExpression) and nspredicate Regular Expressions in iOS Reference: http://www.cocoachina.com/industry/20140321/8024.html NSPredicate Cocoa provides an NSPredicate class to specify filter

Predicate NSPredicate, nspredicate Cocoa provides the NSPredicate class, which specifies the filter conditions and retains the objects that meet the conditions. The result of predicate filtering is also an array.CoreData also uses predicates to

Sort out the pitfalls (text) in iOS9 adaptation and ios9 adaptation This article mainly describes some pitfalls in iOS9 adaptation. If you only need to understand the new features of iOS9, you can refer to the new features of the iOS 9 SDK that

UILabel adaptive height, width, UILabel adaptive, width Adaptive height based on Label and font size - (void)getHeightWithLabel:(UILabel *)label andFontSize:(CGFloat)size{ label.numberOfLines = 0; NSMutableAttributedString *labelString =

Closure (block), closure block Block mainly solves the problem of reverse value transfer and value transfer. 1. Type of the return value of the block Statement (^ name) (parameter list ); 2. block implementation formula name = ^ (parameter list ){};

Search and filter in TableVIew: predicate and tableview Predicate Search in TableView to filter out the content you need. The predicate in iOS is NSPredicate. the predicate function really misses the query statement in the database, that is,

Download ASIHTTPRequest and asihttprequest ASIHTTPRequest is a very useful open-source HTTP access project. It is very convenient to use and can effectively reduce the amount of code. it provides powerful functions such as asynchronous requests,

Network start --- multithreading --- blocking main thread (demonstration) (1), --- Multithreading 1 # import "ILViewController. h "2 3 @ interface ILViewController () 4 5 @ end 6 7 @ implementation ILViewController 8 9-(void) viewDidLoad10 {11

Accelerometer and gyroscope, accelerometer Gyroscope If an instance of the motion manager needs to be created in the program, an instance should provide the accelerator and gyroscope motion services to the whole program. because the device only has

[Reading Notes] iOS-category, Reading Notes ios- 1. Category is a way to add new methods to existing classes.   Ii. Category limitations. 1. You cannot add new instance variables to the class. The category does not have a location to accommodate

[Reading Notes] iOS-features, Reading Notes ios- 1. The @ symbol indicates "you will use the special usage of Objective-C ". @ Property is a new compiler function that declares a new object property.   2. @ property pre-compiled commands are used

[Reading Notes] iOS-Coco memory management rules-owner objects, ios-coco management rules 1. Event loops. A typical graphic application often spends a lot of time waiting for user operations. The program remains idle until the person controlling

Paper tail ----- UIKit basics-UITableView, end of uitableview list I. Basic Introduction In iOS, the most common way to display table data is to use UITableView. UITableView inherits from UIScrollView. Therefore, it supports vertical scrolling and

Paper tail-Quartz2D-timer CADisplayLink snow effect, cadisplaylink Timer CADisplayLink snow Effect 1. The overall idea of timer Snowflake:First, draw a snowflake on the Controller View.After the View is loaded, add a timer.Call the paint method in

IOS essay-Xcode usage-document translationAbout Debugging with Xcode: Finding and eliminating code problems with Xcode regulators is a key part of the development process. The common debugging functions preset by the Xcode debugger can automatically

IOS study notes, ios learning materials 1. TableView comes with the sliding delete function. You only need to implement the proxy method tableView: commitEditingStyle: forRowAtIndexPath: method. You can perform data operations in the method and

IOS array out-of-bounds Solution The so-called array is out of bounds, that is, if your total number of subscripts is now 32, then you execute another method in the next second to wake up from 50 data records, assign values, filter, and so on. At

OC basics-constructor id type, oc Constructor Implementation principle of the new method: New has done three things. 1. Open up the bucket + alloc Method 2. Initialize all attributes (member variables)-init Method 3. Return the object

Motion Design for iOS, motionios Book Description Motion Design for iOS is a first-of-its-kind guide that explains how to both design & build wonderful, immersive animations for iOS. learn about the history of animation and motion, the basic