Objective-C

Empty stringin iOS applications, if you request data from the network, return JSON or XML format data, often encounter empty string, the general interface is written in Java and other languages, if it is Android, because the source language is Java,

turn from: http://blog.jobbole.com/45963/ In the past few years, a lot of objective-c developers have emerged. Some are turned from dynamic languages, such as Ruby or Python, and some are transferred from a strongly typed language, such as Java or

Words don't say much, learn so much, write a quick sort first.In addition to the Quick platoon, there is time to add heap, merge and so on.Learned today, classes, protocols, grammars.Because the algorithm class, more than one algorithm. So create a

want to improve the next to do the application to the customer to take the experience, so watched a few days OC Caanimation Animation class, also done a few small cases, the following individual cases to do as the main content of this article. One:

This article turns from: Http://blog.csdn.net/yuquan0821/article/details/6646400/, overviewKVO, Key-value Observing, provides a mechanism for the object to receive notification when the properties of the specified object have been modified. Simply

1. Basic concepts of category Encapsulation is an object-oriented feature, and OC is no exception. However, sometimes we encounter a situation where we encapsulate a class and don't want to change it any more, however, we need to add a method to

AboutKVC (Key-value-coding)Key-value Encoding 1. Key-value encoding is a mechanism used to indirectly Access Object Attributes. Using this mechanism, you do not need to call the setter, Getter methods, or variable instances to access object

Send messages to nil In objective-C, sending messages to nil is completely valid-it does not work at runtime. Several Methods in cocoa have taken advantage of this. The returned values of messages sent to nil can also be valid:• If a method returns

Iskindofclass: returns a Boolean value that indicates whether the caller is an instance of given class or an instance of any class that inherits from that class.Ismemberofclass: returns a Boolean value that indicates whether the specified er is an

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

Form http://topic.csdn.net/u/20091212/14/eed674bc-b074-4269-8450-f9ca659103c0.html   1. The biggest difference: all are object-oriented languages evolved from C. 2. The biggest difference is that C ++ is a static language, while OC is a dynamic

I wanted to translate it, but I saw some translations on the Internet, so I directly reproduced it. Original post address: http://www.i-alive.com/post/45/ English address:

How can I convert an XIB file to an object-C source code? You can use nib2objc to download the source code of this tool from https://github.com/akosma/nib2objc. The downloaded project code is compiled with xcode to generate a command line program

FW: http://blog.csdn.net/dboylx/archive/2009/02/15/3893770.aspx   After reading the previous memory management document, I have a preliminary understanding of the objective-C memory management mechanism. However, it is far from enough to just renew

I. golden rules for memory management: The basic rule to Apple is everything thatincreases the reference counter with alloc, [mutable] Copy [withzone:] Or retainis in charge of the corresponding [auto] Release. If an object uses alloc, [mutable]

Objective-C method replacement (Method replacement for fun and profit) This article will discuss method replacement and swizzling in objective-C ).   Overriding Methods) Overriding methods is common in any object-oriented language and is mainly used

In IOS apps, if you want to save big object data, you can use XML files or attribute files. However, because the plain text method is not confidential enough, for example, you can encapsulate the stored data as an instance of a custom class and save

Objective-CGrammar-something about dictionary objects 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

Nonatomic: Non-atomic access, no lock when assigning values to attributes, multi-thread concurrent access will improve performance. If this attribute is not added, both access methods are atomic transaction access by default. (Atomic is a thread