Objective-C

When C ++ (. cpp) or objective-C ++ (. mm) is used in objective-C (. m), the following error occurs during compilation: Expected '=', ';', 'asm 'or' _ attribute _ 'before *** The reason is that C ++ or objective-C ++CodeIt is called by objective-C

If two strings are equal, use isequaltostring: instead of just comparing the pointer values of the strings. For example: Nsstring * thing1 = @ "Hello 5"; nsstring * thing2; thing2 = [nsstring stringwithformat: @ "Hello @ D", 5]; If ([thing1

A framework is a software package that contains multiple classes. Mac operations provide dozens of frameworks to help us quickly develop applications on MAC systems.Program.In these frameworks, there are some basic frameworks, including: string

Objective-C uses nsstring to operate strings. nsstring is called a non-modifiable string because the content and length of a string cannot be modified when you create a string using nsstring. 1. Create a string Nsstring * STR = @ "I Am a

common methods for creating nsdictionary: + (ID) dictionary; + (ID) dictionarywithobjtct :( ID) object forkey :( id ) Key; + (ID) dictionarywithobjectandkeys :( ID) firstobject ,... + (ID) dictionarywithdictionary :( nsdictionary *

What are the strings in objective-C syntax? If the original Yusong Momo article is reprinted, please note: It is reprinted to my independent domain name blogYusong Momo program Research Institute, Original address:

Parse HTML is the same as Parse XML. You can use the parse XML method to parse HTML. nsstring * Path = [[[nsbundle mainbundle] resourcepath] stringbyappendingpathcomponent: @ "parsefile.html"]; // obtain the file path nsstring * string = [[nsstring

In the past two days, I want to see how the legendary iPhone application is made. Taking this idea as a preliminary attempt, the first problem encountered was the establishment of the Development Environment on Windows. After all, it was just fun to

Class type So far, we have known the SEL data type corresponding to the method. Like Sel, in objective-C, we can not only use the SEL corresponding to the method, for Classes in objective-C, a similar mechanism is also provided for us, class type.

Objective-C Syntax: What about a set object? If the original Yusong Momo article is reprinted, please note: It is reprinted to my independent domain name blogYusong Momo program Research Institute, Original address:

Installed xcode 4.6 and now facing with new errors in an existing ent code I manage. The compiler now complains about "direct access to objective-C's Isa is deprecated in favor of object_setclass () and object_getclass ()" And won't

I. Preface For most people who have switched from C ++ or Java to learn object-C (hereinafter referred to as OC), the language OC looks strange and troublesome to use. OC does not have the same garbage collection mechanism as Java. That is to say,

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 code blocks, you can pass in the number of parameters and get the return value just like calling other

Memory management basics When you write an application for Mac OSX, you can choose to allow garbage collection. This means that you do not have to consider memory management if it is not particularly complex. However, you will not always work in an

1. The inherited syntax is as follows: @ Interface testcoop: nsobject {Int Imonth;Int iyear;Int iday;} -(Void) setyear: (INT) iyear;-(Void) primalsetdata: (INT) iyear :( INT) Imonth :( INT) iday;-(Void) setdata: (INT) year Imonth :( INT) Imonth iday

  I have written a similar article before. I want to help my new brother. Pai_^ The objective-C memory management mechanism in the iPhone system is flexible, that is, it can be used like C/C ++, you can also add an autoreleasepool to upgrade it to a

A collection (nsset) object is a combination of Single-value objects. For example, a set of 1 to 50 numbers. Operations on collection objects include searching, adding, and deleting members in a set, comparing two sets, and calculating the

The role of the Protocol is similar to the multi-inheritance of abstract base classes in C ++. Similar to the interface concept in Java.The Protocol is a list of multiple class sharing methods,Methods listed in the Protocol are not implemented in

Three Characteristics of object-oriented encapsulation, inheritance, and Polymorphism Encapsulation: Hiding internal implementations and stabilizing external interfaces. Encapsulation is to define the class definition property definition

Address: http://howtomakeiphoneapps.com/2009/05/for-and-foreach-loops-in-objective-c/     Loops are the gears of programming: they make your code take action. The two loops I use most often is the For Loop (to do a predefined number of steps) and