IOS

Details about CALayer 3 and calayerCALayer3-layer attributesContents 1. Implicit animation attributes Ii. position and anchorPoint Back to Top 1. Implicit animation attributes * As mentioned above, each UIView is associated with a CALayer by

Detail consideration and implementation of the circle of friends comment function, details of the circle of friends comment function1. circle of friends The layout of the circle of friends is very easy, and there are a lot of similar code on the

Differences between Copy and MutableCopy: copymutablecopy NSString * string = @ "origion"; NSString * stringCopy = [string copy]; NSMutableString * stringMCopy = [string mutableCopy]; [stringMCopy appendString :@"!! "]; Note the following points

UICollectionView basics, uicollectionview UICollectionViewFlowLayout *flowLayout= [[UICollectionViewFlowLayout alloc] init];    flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;// Scroll direction    flowLayout.minimumLineSpacing

Simple use of FMDB, simple use of FMDBCommon FMDB classes: FMDatabase: A single SQLite database used to execute SQL statements.FMResultSet: Execute to query an FMDatabase result set, which is similar to the android Cursor.FMDatabaseQueue: this class

Copy, kvc, and kvo in iOSThere are two methods to copy an object.Copy: returns an immutable copy.Only NSString to NSString must be copied in shortest mode, and others must be in deep copy mode. Deep copy object: Specifies the shortest copy pointer.

18th-day notes (archiving and archiving operations) for IOS and 18th-day ios Knowledge points of IOS Learning (oc language) I. Archiving and archiving operations   1) Archiving is a process in which one or more objects are stored for future

Add startup authorization for iOS8 UILocalNotification   I haven't accessed UILocalNotification for a long time. I found that I have no permission to start the notification today.The error is as follows: Attempting to schedule a local notification

IOS animation implementation SummaryIn iOS, there are two types of animation implementation directions: one is the animation method that operates UIView, and the other is the core animation, but in iOS 7, UIView is also involved with core animations.

Brief Introduction to NSPredicate, nspredicateSeveral main calculation methods in NSPredicate 1. Comparison operators>, =, Example: @ "number> = 99" 2. logical operators: AND, OR, and not operators calculate AND, OR, AND non-results. 3. Range

Ios dictionary-to-Model # Import @ Interface AppInfo: NSObject @ property (nonatomic, copy) NSString * name; @ property (nonatomic, copy) NSString * icon; // instancetype (instancetype) initWithDic :( NSDictionary *) dic; // The class method

Introduction and use of Grand Central Dispatch (GCD) for iOS multi-thread programmingIntroduction: Grand Central Dispatch (GCD) is a technology developed by Apple to optimize applications that support multi-core processors and other systems of

IOS development UI basic UIView and iosuiuiview This section mainly introduces the basic concepts of UIView and some attributes. The attribute users will be described in detail later.-Basic concepts of UIView 1. What is a control? All the UI

IOS UITableView dynamically hides or displays Item and iosuitableview Hide and display items by changing the height of items to be hidden   1. Create UITableView #import "ViewController.h"@interface ViewController ()@property(nonatomic,

Basic use of Masonry, use of Masonry During the learning process, I learned about this automatic third-party framework-Masonry. Masonry is a lightweight layout framework that uses concise code to replace lengthy and tedious AutoLayout code. This

IOS obtains the Date value x minutes ago/x hours ago/yesterday/x days ago/x months ago/x years ago Returns x minutes ago/x hours ago/yesterday/x days ago/x months ago/x years ago    -(NSString *) timeInfo {return [NSDate timeInfoWithDate: self];} + (

IOS delayed execution (OC) This article lists four methods for delaying the execution of a function and their differences. If the latency is 1 second, execute the following method. - (void)delayMethod{ NSLog(@"execute");} 1. performSelector

IOS intermediate -- multithreading -- NSOperation, ios -- nsoperationThe NSOperation operation task encapsulates the code and the operation encapsulates the task. The purpose is to pause, resume, and cancel the task at any time; NSOperation

Several code delay execution methods in OC and oc Code DelayFirst: [UIView animateWithDuration: 3 delay: 3 options: 1 animations: ^ {self. btn. transform = CGAffineTransformMakeTranslation (300,400);} completion: ^ (BOOL finished) {NSLog (@ "view

IOS custom colletionView (pure code) Everyone said that colletionView and UITabbleView were brothers, and colletionView came out after IOS 6. colletionView and UITabbleView were indeed brothers, but you encountered many pitfalls when using them.For