Objective-C

The parameter model has a two-dimensional array of data, and the order matrix . h documents @class Datamodel; @interface algorithm:nsobject @property (nonatomic,assign) int addscore; Bonus points-(void) Caculatetop: (Datamodel *)

? %@ objects? %d,%i integers? %u no shaping? %f floating-point/double word? %x,%x binary integer?         %o octal integers? %zu size_t? %p pointer? %e floating-point/double word (scientific calculation)? %g floating-point/double word? %s C string? %

Introspection (introspection) is a powerful feature of object-oriented languages and environments, and objective-c and cocoa are particularly good at this aspect. Introspection is the ability of an object to reveal its detailed information as a

1. The old project did not use arc, but the introduction of the third party library is the use of arc.2. Arc was used for its new project, but the introduction of Third-party libraries or previously written code did not use arc. In both cases, the

Thus, we arrive at the rules so all stylish objective-c programmers follow when writing initializers:if a class has SEv eral initializers, only one should does the real work. This is known as theDesignated initializer. All other initializers should

Block closure is a relatively advanced concept in OC. We understand by simple code: #import #import "AppDelegate.h" //code block declaration; return value int, parameter type int, int; int (^max) (int,int ); typedef void (^sayhello) (); int

#import int main (int argc, const char * argv[]) {@autoreleasepool {///////// Determine whether two strings are the same; NSString *string1 = @ "Hello worl D "; BOOL SS = [string1 isequaltostring:@ "A"]; NSLog (@ "%HHD", SS);

The Protocol (PROTOCOL) in Objective-c is similar to the commonly used interface, the method defined in the Protocol (Protocols), implemented in the class. @protocol Myfirstprotocol -(void) Myfirstprotocolmethod; @end In the iphone OS, Protocol (

Starting with xcode4.4, the LLVM4.0 compiler adds some new features to Objective-c. Creating an array nsarray, a hash table nsdictionary, and a numeric object NSNumber can be as simple and convenient as the initialization of a nsstring. Mother is no

This article mainly introduces the objective-c in the NSLog output format of the relevant data, very simple, the need for small partners can refer to. ? %@ objects ? %d,%i integers ? %u no shaping ? %f floating-point/double word ? %x,%x binary

Ocstudy Main.m // Starting from the home directory, find the path to all files with the file extension jpg Created by Mark on 11-10-30. Copyright 2011 __mycompanyname__. All rights reserved. // #import int main (int argc, const char * argv[]) { @

Holydancer Original, if need to reprint, please indicate in prominent position: transferred from Holydancer's csdn column, original address: http://blog.csdn.net/holydancer/article/details/7355833 In Objective-c, we can use new simple instead of

For iOS applications, in order to maintain memory efficiency, the system will closely monitor the object's reference count, and when the reference count is 0 o'clock, the object will be released immediately. In general, use release is sufficient:

is about to release Swift 4, oneself is also learning swift, behind the IOS programming estimated also fast is the world of swift, but I still in this hold a book that says OC is gnawing, strange only blame oneself before too lazy, according to

Tag: Port lock based on ASC core IDG a dot ValHttp://www.cocoachina.com/ios/20160127/15105.htmlRecently, the company's operations to engage in a blind activity, its activities to provide data support services, the Web front-end in the public account

First, the introduction of the prototype model of the encyclopedia:Definition: Specifies the kind of object created with the prototype instance, and creates a new object by copying the prototypes. Prototype prototype mode is a creation design

There are two ways to invoke the message of an object in OC:# # #. Performanceselector:withobject:#2. Nsinvocation.The first performaceselector is more common and simpler. But this method can only pass a maximum of 2 parametersWhen you need more

During the development process, we will encounter a lot of string operations. It is a common data type, and the usage of it is summarized below: // 1. Create a constant string. Nsstring * astring = @ "This IsString! "; // 2. Create an empty string

Some points worth attention in objective-C: 1. there are the following aspects about bool traps: it is best to compare bool condition statements with the no value, because bool's yes and no values are only agreed, in addition, the compiler

The basics of objective-C are supported by the GNU Compiler Collection. in order to utilize the full power of objective-C together with the cocoa/openstep environments on Linux, and to work with privileges of the examples covered in this book, it is