object_c

毛勇
2023-12-01

object_c 类声明:

@interface 类名:NSObject

{

}

@end

object_c类定义:

@implementation 类名


@end


如下例:

#import <Foundation/Foundation.h>

@interface ABC:NSObject

{

  int x;

  int y;//instance varaiables

}

@property int x //声明

 

-(void ) duixiangfangfa: setx:(int ) n//对象方法

+void leifangfa:sety:int (n);//类方法

-void insertObject:(id) anObject  atindex:(int)index;//对象方法多个参数调用时【对象名 insertObject:object atindex:index】

 实例对象要在要在括号里面;实例方法要在外边;

@end

#import "ABC.h"

@implementation ABC

@synthesize x;//属性实现

@end

@

main.m

@property  通过属性来访问内部变量,而不能直接访问类成员呢;

[对象名 setX:1]

 

建构造

另外继承不只是NSObject 还有NSException;

时间紧急,还是先学会一些能迅速用到的事情,其他事情以后再说

NSNumber *YY=[NSNumber numberWithFloat:10.0];

[YY floatValue];

%lg %s %f %i

numberWithChar

stringWithString:(NSString *)string

stringWithFormat

NSString *ne=[NSString stringWithFormat:@"%@ Object",NSString *duixiang];

stringByAppendingString

NSString *ne;

NSString *na=[ne StringByAppendingString:@"dsd"];

isEqualToString 相等为1;

[string1 isEqualToString:string2]==1;

hasPrefix:判断开头字母;

uppercaseString lowercaseString

NSLog

substringToIndex substringToindex 

substringFromIndex

stringWithContentsOfURL

stringWithContentsOfURL

length NSint

characterAtIndex

UTF8String doubleValue floatValue 

 NSString * 其实就和const char *一样不可以修改;stringByAppendingString 也是将更改的值赋予新的对象来着;

NSMutableString *string;//构造方法吧:NSMutableString stringWithString:string 构造方法都是NSString 下面的

[string appendString]

appendFormat  @“%@”;

insertString:atIndex :5

NSMakeRange

replaceCharactersInRange

数组;

不可修改的数组:arrayWithObjects

NSArray *city=[NSArray arrayWithObjects:@"beijing",@"sh",@"ty",nil]

[city count];

objectAtIndex

[city objectAtIndex:3]

indexOfObject

[city indexOfObject:@"beijing"];

常用方法:

arrayWithObjects :obj1 obj2 nil

(BOOL)containsObject:obj;

count

objectAtIndex//nil

makeObjectsPerformSelector:(SEL) selector;

sortedArrayUsingSelector:(SEL) selector;

NSMutableArray  *数组对象名=[[NSMutable alloc]init]

addObject

removeObject

objectAtIndex:

removeAllObjects

replaceObjectAtIndex

NSDictionary

NSDictionary dictionaryWithObjectsAndKeys

initWithObjectsAndKeys

setObject forkey

objectForkey

removeObjectForKey

setObject:obj forKey:key

NSSet

setWithObjects

[set count]

 写完最后一部分协议就应该可以上手看interface builder了,哎 人艰不拆啊;

协议在类中的声明;

@protocol

方法声明

@end

@implementation 类名

类和协议中声明的方法的实现

声明协议:

@protocol ASD<NSObject>

-(void) go

@end

@interface ABC:NSObject<ASD>

@end

@implementation ABC

-(void) go

{

 

}

@end

@protocol ASD<NSObject>

@interface ABC:NSObject<ASD,ASF,ASG>

@end

 object -c 消息

 

@selector delegate 这两个是最难点的了。。。

 

终于明白了;那比如说我用xib来做东西;那nib就是初始化里面的初始化的界面;那viewcontroller就是来获得你点击的事件的;那delegate呢 就是获得事件要具体干啥子来呢,就有delegate来做具体的业务逻辑;明白了这些应该可以上手了

推荐一个网页

(4.4.1)使用storyboard实现页面跳转,简单的数据传递

http://blog.csdn.net/mad1989/article/details/7919504 very good!

 

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