Objective-C

Overview: The array inside OC is a linear structured data type, within the foundation framework. Divided into mutable arrays (Nsarray) and non-variable groups (Nsmultiarray), where MultiArray inherits from Nsarray, so Nsarray's

1#pragmaMark---------------Variable Array-----------------2//can be used in the array to delete and modify the operation3//4//variable arrays are related to arrays: mutable arrays are subclasses of arrays,5//How to initialize a mutable

1. Create a new class that inherits from UITableViewCell2. Overriding Initwithstyle:reuseidentifier: MethodsAdd all the child controls that need to be displayed (you don't need to set the child control's data and frame, and the child controls are

The collection class in iOS is like a collection in mathematics, where elements must be unique, storage elements are unordered, and storage elements must be object types.The set is divided into immutable sets (Nsset) and mutable sets

Add a "property" to a categoryWe know that you can add methods to a category, but you can't add properties . Do we have another way to do that?Let's take a look at the following code:@interface UIView (nl_Frame)@property (nonatomicassignCGFloat

After the Objective-c object receives the message, what method is called to be resolved during runtime. Then you might ask: Does the method corresponding to the given selection sub-name change at runtime? Yes, that's it. Using this feature can be a

The NSString and Nsattributedstring classes in Cocoa Foundation provide us with support for Unicode strings, the biggest difference between NSString and nsattributedstring classes is: nsstring-- the content and length of the string cannot be

Here is an example I wrote to test how Objective-c uses the class'sTestClass.h testclass.h// testclass//// Created by exchen on 6/15/15.// Copyright (c) exchen. All rights reserved.//#import @interface testclass:nsobject{ //public member

1. Prefacebelieve that contact with OC is very familiar to NSLog, carefully review the original definition of NSLog, will find that his prototype is as follows:FOUNDATION_EXPORT void NSLog(NSString *format, ...) NS_FORMAT_FUNCTION(1,2);Path in:OS X

These days the programming with Objective-c again looked aside, found a lot of previously unclear places. Now write down some important points and consolidate the learning effect.1.objective-c Classes is also Objects (OC class is also an object)In

Whether an instance object in Objective-c supports a copy operation depends on whether the object implements the Nscopying protocol:@protocol nscopying-(ID) Copywithzone: (Nszone *) zone; @endFor mutablecopy operations, there is a nsmutablecopying

Use of blocks (block) //No parameter no return value void(^message) (void) = ^{NSLog (@"Hello world!\n"); }; //have a parameter return valueNSString * (^repeat) (NSString *,int) = ^ (NSString *str,intTimes )

Block blocks of code/* What the block wants to know 1> how to define the block variable int (^sumblock) (int, int), void (^myblock) (), 2> How to use block encapsulation code ^ (int a, int b) { return a-B; }; ^ () {NSLog (@ "----------");}; ^ {NSLog

the practical function of category is to add methods to existing classes. The methods added for the existing classes can be implemented without implementation and can be implemented again when needed. How do we implement category in our actual

------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! -------thinking after a class exercise/* Requirements: Design a class point2d to represent a point in a two-dimensional plane 1> property *

#pragma mark-block SyntaxNSLog(@ "========block method 1==========="); [Students sortusingcomparator: ^nscomparisonresult(ID obj1, ID obj2) { Student *stu1 = (Student *) obj1; the obj1 here is the Student type. Student *stu2 = (Student *)

First, look at the typical nsstring and Cfstringref conversions.http://www.tuicool.com/articles/MJRr226Cfstringref to nsstring *nsstring *yourfriendlynsstring = (__bridge NSString *) yourfriendlycfstring; //NSString * to Cfstringrefcfstringref

1.info.plist Common Settings* After building a project, you will see a "project name-info.plist" file under the supporting Files folder, which is very important for the project to do some run-time configuration, and cannot be deleted.* In the

One. Basic data types1. General computer language when defining variables, you need to provide two content: type and name.For example: int myclassid;2. In Xcode, whether you are using the GCC compiler or the LLVM compiler, if we do not initialize

Understanding Method Swizzling is a good opportunity to learn the runtime mechanism. Not much to do in this, only translated by Mattt Thompson published in Nshipster's method swizzling article.Method Swizzling is a technique that changes the actual