Objective-C

Copyright notice: This article for Bo Master original article, without Bo Master permission not reproduced. 0. Roles required in this ORMIn this ORM, there are at least so many role entities, based on the expected needs and considerations that are

Copyright notice: This article for Bo Master original article, without Bo Master permission not reproduced. The basic requirements of this ORM are illustrated by a common example of database relationships. class, Student This pair of tables, the

How to master a high-level programming language:(here specifically objective-c)bottom-up thinking: down, how to think about the process of running the program from the bottom of the machine. Focus on language constructs, compilation transformations,

The overall architecture of iOS (take iOS8 as an example) is shown below:From cocoa touch to core OS the four tiers below contain all the APIs that are used to develop iOS applications (third-party frameworks are based on these layers). Each layer

Shimen the main contribution, respect the work of the author, please do not reprint. If the article is helpful to you, you are welcome to donate to the author, support Shimen, and donate any amount. Heavy on the mind ^_^ I want to donate: Click

#import int main (int argc, const char * argv[]) { @autoreleasepool { Nsset *set1 = [Nsset setwithobjects:@ "a", @ "B", @ "C", @ "D", nil]; Nsset *set2 = [[Nsset alloc] initwithobjects:@ "1", @ "2", @ "3", nil]; Nsarray

first, the difference between the @dynamic and the @synthesize @property has two corresponding words, one is@synthesize, one is @dynamic. If @synthesize and @dynamic are not written, then the default is @syntheszie var =_var; The semantics of

In the MRC environment, assuming that the Ctroom object is a member variable of Ctperson, it should be noted that the code is as follows when modifying the Ctroom object:-(void) Setroom: (Ctroom *) room{It is necessary to determine whether the new

Runtime: Run-time mechanismThe first thing to understand:1. What is1> runtime is a relatively low level of pure C language API, belongs to 1 C language Library, contains a lot of the underlying C language API2> usually write the OC code, in the

Cocoais a native compilation environment on Mac OS x systems. He contains two frames, which are actually a series of libraries, Foundation and AppKit.On your iphone and other handheld devices, use one of his subcategories-Cocoa Touch. The Foundation

First, the simple use of UITableViewDisplay Features:1, show how many to the District group2. How many rows of data are displayed3. What is displayed in each rowThe agent will not remind you what method is not called, but Uitableviewdatasource will1)

With the data type of int in objective-c, why use a numeric object NSNumber? This is because many classes, such as Nsarray, require the use of objects, while int is not an object.NSNumber are numeric objects, and we can use NSNumber objects to

rules for memory management :1.alloc created must be freed, convenience constructor created do not release2. Objects added to the container are executed once retain operation, reference count plus 13. The container removes the object and sends a

As alocal variable:returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};As a Property:@property (nonatomic, copy) returnType (^blockName)(parameterTypes);As amethod Parameter:-

11.1 Using attribute values@propertyfloat rainHandling;//表明此类具有float类型的属性，其名称为rainHandlingNote: The name of the property does not have to be the same as the instance variable name.@synthesize rainHandling;//表示创建了该属性的访问代码Note : After you use a

1. What is a property? What do attributes do for us? Please explain it in detail.(1) The ① property is the syntax defined by OBJECTIVE-C 2.0, which provides the default implementation of setter and Getter methods for instance variables, ② to some

Core Foundation objects are primarily used in the core Foundation framework written in C and reference the counted objects. There are very few differences with OBJECTIVE-C objects. No matter which framework generates the object, once generated, Can

The category in OC is similar to the extension in Swift. It is often used to extend some methods to objects of the basic data types such as int, NSString, Nsarray, and so on.There are two main uses: the basic type extension and the function forward

The code block is essentially similar to other variables. The difference is that the data stored in the code block is a function body. Using a code block, you can pass in the number of arguments and get the return value just like calling other

Differences between # import and # include in objective-C Pre-compiled commands Objective-C: # Import C, C ++: # include # Import supported by the GCC compiler In objective-C, # import is used as an improved version of the # include command. In