Objective-C

Original address: Java long time and objective-c time conversion The problem of one-month-long Java time and objective-c time conversion problems have finally solved, I did not think so simple Java time/1000 is objective-c time. Expand the NSDate [

(i) Pointer assignment in a string, copy and MutablecopyNSString and NSString(1) Pointer assignmentMust point to the same string address.(2) Copy (same as direct pointing) NSString *[email protected] "AAA"; NSString *str2=[str1 copy]; NSLog

/*---------------------Nsarray---------------------------*/ //Create an array Nsarray *array1 = [Nsarray arraywithobject:@"1"]; Nsarray *array2 = [Nsarray arraywithobjects:@"1", @"2", @"3", nil]; Nsarray *array3 = [Nsarray

0. Determine if there are any characters in the stringif ([Roadtitlelab.text rangeofstring:@ "Qingjoin"].location!=nsnotfound)//Determine if Roadtitlelab.text contains Qingjoin} else {NSLog (@ "no");? }1. Intercepting stringsnsstring*string [email

One instance method visibility, Method 1. Visibility visibility of instance variables                           &NBSP ;                          ,         &NB Sp       features public (common)                         &NB Sp                    

OverviewSince the launch of the WWDC 2015 and the Open source Swift 2.0, everyone's enthusiasm for Swift has soared again, while the envious startups ' friends talk about Swift's new features, as well as many developers who still need to stick to

Uiview,uilabel,uitextfield,viewcontroller .....However, none of the above is quite understood ...Here's what you learned =w=While the Baidu side learned. So many things come from other blogs. The back will post the source.. Frame: The position of

The protocol in OC (PROTOCOL) is similar to the interface in. NET (Interface), which is simply a list of a series of methods that can be implemented by any class. The difference is that in. NET, if a class implements an interface, it must implement

directory of this document First, what is a null pointer and a wild pointer Two examples of wild pointers and null pointers Description: This objective-c topic is a prelude to learning iOS development, and to enable programmers

NSStringRepresents a string class in OC%@ is the format character for objects in OCprintf cannot print objects in OCBy stringWithFormat: This class method, print the formatted stringCasesint a = 10;NSString * str = [NSString stringwithformat:@

The method of invoking a class or instance (object) in a specific language in the OC language is called a Send message or method call.There are two ways to invoke methods in OC:The first type: [Class name or object name Method name];

12.1 Creating categoriesCategory is a way to add a new method to an existing classExample: Get the length of a string and deposit it into the Nsdictionary dictionary Ways to not use categories: NSNumber *number; number =

Reprint Address: http://www.cnblogs.com/mjios/archive/2013/03/28/2983753.htmlDirectory of this document Objective First, Introduction Second, Syntax preview Description: This objective-c topic is a prelude to learning iOS

Prior to learning C + +, or Java, there was a visibility issue, and this article discussed the visibility of declared member variables on object methods (minus methods) and class methods (plus methods).(a) Code one: member variables are visible to

This post implements the simplest subtraction operation using OC, which includes concepts such as variable definition, operation method, and formatted output. The main learning basic grammar, in fact, and the C language syntax is still more

typedef struct PERSON{int age;Char *name;}person;int main (int argc, const char * argv[]) {@autoreleasepool {person person;Person.name = "Little Fellow";Person.age = 20;Person Liusanjie;Liusanjie.name = "Liu Sanjie";Liusanjie.age = 45;/*1, the

ConceptNSLog () can use the%@ format specifier to output an object. When NSLog () processes the%@ specifier, it asks the corresponding object in the argument list to get a description of the object. Technically, NSLog () sends a description message

The usage of @property and @synthesize in Objective-c1. Keywords @property and @synthesize are paired in Obj-c and are used to simplify the coding of declarations and implementations;egdeclaration in the header file (. h)@property int

Objective-C supports global variables. There are two main implementation methods: the first one is the same as that in C/C ++, and the "extern" keyword is used; the other is the singleton implementation. (For example, we often put a variable in

% @ Object % d, % I integer % u unsigned integer % F floating point/double character % x, % x binary integer % O octal integer % zu size_t % P pointer % E floating point/double character (Scientific Computing) % G floating point/double character % s