Objective-C

iOS has three multithreaded technologies: 1.NSThread Created in two ways: 1. Instance method: -(ID) Initwithtarget: (ID) Target selector: (SEL) Selector object: (ID) argument You can set thread

Swift Project Mixed OBJECTIVE-C Create a swift project:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/7C/C2/wKiom1bXsLexFGl7AAD9_MjfQos724.png "title=" screen shot 2016-03-03 a.m. 11.34.16.png "alt="

Associated Objects mainly has the following three usage scenarios:1. Add a private variable for the existing class to help implement the details2. Add the public attribute to the existing class;3. Create an associated observer for KVO.There are 3

Type-member Type MemberMembers of struct structs are simple, only variables.There are many members of the class:Data member Description Object ( The focus of this lecture )· Instance variable instance variable· Attribute PropertyFunctions member

Hello, I am kellybaby. Today we are going to introduce objective-c language.Friends around the classmate said, I give them to explain the things are always very vernacular, easy to understand, I hope that this vernacular programming language to

First, the origin of the problemAll originated in Apple's official documentation for the sample code for Singleton (Singleton): Creating a Singleton Instance.The main controversy is focused on the following paragraph: static

Definition and use of the Protocol What is an agreement?Can be used to declare a whole bunch of methods (cannot declare member variables)As long as a class follows this protocol, it is equivalent to having all the method declarations in this

Block type Block is a data type that is widely used in iOS development and is highly recommended by Apple, which functions like a function pointer in C.^ is a unique symbol of block.The implementation code for the block is included in the {}.In

Uiimageview+faceawarefillThis category uses the Aspect fill content mode, which can be automatically adjusted to the image content, and when the face is detected, it replaces the center of the image with the center of the face. Test environment:

the method that the class method uses to create the object is the factory method1. Non-reference factory methodcreate an object and give the property a default value. // no reference factory method implementation + (student*) student{ return

Thread synchronization is implemented in 1,objective-c:Mutexlock (mutex), Nscondition Lock (conditional lock) Message delivery2,UDP and TCP:TCP: Transmission Control Protocol, which provides connection-oriented, reliable, point-to-point

There are 3 main usage scenarios for Category: Add a method to an existing class; Splitting the implementation of a class into multiple independent source files; Declares a private method. Implementation Principle : We know that regardless of

　　 Compounding : Combining multiple components together to form a whole and then work with the whole, which is called a compositeThe overall function is more powerful after compoundingWrite a house class, composed of doors, windows and so on, doors

After exposure to the open source project masonry, I am interested in the chained notation of the layout constraints, as follows: 1 2 3 4 5 6 7 8

Objective-c delegation and protocol this has no relationship, the agreement as mentioned above, is to play the role of pure virtual class in C + +, for the "delegation" is not related to the agreement, but we often use the Protocol also implement

1 ifMrhiggieismean = NO; if (Mrhiggieismean) { NSLog (@ "confirmed:he is super mean");}2 if ElseBOOL Mrhiggieismean = [Mrhiggie Areyoumean]; if (Mrhiggieismean) { NSLog (@ "confirmed:he is super mean");} Else { NSLog (@ "No, actually he ' s

1. Trigonometric FunctionsDouble sin (double); SinusoidalDouble cos (double); cosineDouble tan (double); tangent2, Inverse trigonometric functionDouble asin (double); Results between [-PI/2, PI/2]Double ACOs (double); Results between [0, PI]Double

Objective-c Five main features: Fully compatible with C Object oriented Single Inheritance (functions in OC are virtual functions, pseudo-Multiple inheritance through classes and protocols) Dynamic binding (when dynamic_cast

In C # and Java, both method and variable have strict access level control, so the use of access levels in Object-c is very rare, perhaps because there is no access level syntax on method, there is nothing to control variables alone. Let's discuss

1, Nsset1. is an unordered collection class that manages multiple objects, with the greatest feature being that duplicate objects are not allowed in the collection, and that the mathematical set meanings are the same2. Other functions and Nsarray