Objective-C

1. Inheritance mainly reflects the relationship between classes. Using inheritance can reduce repeatedCode.   2. Inheritance Mechanism Method lookup: If a message is sent to an object, the schedulingProgramFind the method corresponding to the

1. category can be used to add new methods for existing classes. 2. categories can be managed and implemented. Multiple methods of different categories can be put into different. M files. For example, nswindow has many categories, such as

// Variable array Nsmutablearray * ma = [nsmutablearray arraywithcapacity: 7]; [Ma addobject: @ "wtq"]; [Ma addobject: @ "WTP"]; [Ma addobject: @ "www"]; For (INT I = 0; I Nslog (@ "Value % @", [Ma objectatindex: I]); } [MaAddobject: @

Video tutorial for iPhone development-objective-C language tutorial-1st-basic syntaxVideo tutorial for iPhone development-objective-C language tutorial-2nd-point syntaxIPhone development video tutorial-objective-C language tutorial-lecture

From cocoa programming for Mac OS X 3rd Mark the token order with a formatted string When a text is converted from one language to another, Words and Phrases change accordingly due to word order changes. For example, the statement"Ted wants a

This articleArticleThis article introduces the comparison between objective-C and the underlying content, mainly explaining the differences between initialize and init methods. In this article, we can not only understand what objective-C did during

Next, we will encapsulate the functions at the bottom, so that they can be used more conveniently. Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Static Gbmusictrack * Track; Static

1. Create strings and class methods Create an nsstring using the formula + (ID) stringwithformat :( nsstring *) format ,......; Eg: Nsstring * height; Height = [nsstring stringwithformat: @ "height: % d length: % d", 10, 20]; The

On the InternetArticleMany of them planned to have a fun game two days ago. As a result, the black apple test failed. The main reason is that the configuration is not enough. The memory must have at least 4 GB to barely OK ...... I bought Acer 4726

I. nsarray Nsarray is a class of cocoa used to storeObject. Restrictions:1. Only objects in object-C can be stored, and basic data types in C language cannot be stored, such as random pointers in int, float, Enum, struct, or nsarray; 2. Nil

In iOS, reload can be performed in two ways: 1. The number of different parameters. 2. If the number of parameters remains the same, modify the name of at least one parameter. This is a strange overload method. Even if the return type is modified,

Use nsenumertor to traverse array elements CodeAs follows: Nsarray * array = [nsarray arraywithobjects: @ "one", @ "two", @ "three", nil]; Nsenumerator * enumerator; Enumerator = [array objectenumerator]; ID thing; While (thing = [enumerator

You can use dictionaries to store data, which improves the search speed. The following describes how to create a dictionary. Nsdictionary * DIC = [nsdictionary dictionarywithobjectsandkeys: @ "Wtq", @ "name1 ", @ "WTM", @ "name2 ", @ "WTP", @

From: http://blog.csdn.net/leebing505/article/details/6432326 Purpose:This article focuses on the general local objective-C on iOS systems.CodeThe basic method for interoperability with JavaScript-based Web applications, and the interaction

From: http://www.cocoachina.com/macdev/objc/2010/1104/2296.html This section parses the htmlCodeShared by cocoachina member "Yuehua Water", we hope to help developers # Import "stringchuli. H "/* Project role: link network resolution HTML */@

From: http://blog.csdn.net/diyagoanyhacker/archive/2011/05/30/6455244.aspx Write Program It is not terrible to encounter bugs. Most problems are solved through simple log or Code The analysis is not difficult to find the cause. However, when the

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Chapter I and Chapter II Basic OC syntax IPhone development tutorial Chapter 1 Basic OC syntax iPhone development overview-required (1.1)Http://www.apkbus.com/android-102215-1-1.htmlChapter 2 installation and introduction of development tools for

Although the keyword of the informal protocol in obj-c is also interface, this is not exactly the same as the interface in c. Recall what we have learned before. When we define a Sample class, we always convert it into a Sample. h. The Code is as

When I read a piece of code today, I found that when NSString is instantiated, sometimes the initWithFormat method is used, and sometimes the stringWithFormat method is used. How should I choose? Differences: 1. initWithFormat is the instance method.