Category: objective-c

UIImageView 是IOS图片控件。点击右上角 加号。可以打开控件窗口

绑定图片到UIImageView

点击UIImageView。右上角image选择图片绑定

Saler.h //头文件声明声明对外公开的方法 声明公共属性和私有属性

@interface Saler : NSObject {
    @private NSThread *thread;
}
@property NSNumber *ticket;
-(void) startSale;
@end

Saler.m //声明具体方法实现 init为默认的构造函数

#import "Saler.h"

@implementation Saler

-(Saler*) init{
    self = [super init];
    NSLog(@"init saler");
    self.ticket = [NSNumber numberWithInt:20];
    //公共属性用.访问
    return self;
}

-(void) startSale{
    NSThread *thread = [NSThread new];
    self->thread = thread;
    //私有属性用->访问
    [thread initWithTarget:self selector:@selector(run) object:nil];
    [thread start];
}

-(void) run{
    NSLog(@"running");
}

@end

NSNetService //socket server

NSPort

子类有NSSocketPort(ip地址 + 端口) //socket client

子类有NSMachPort(应用消息通讯) 多线程通过此端口应用通讯

子类有NSMessagePort (NSMachPort对消息的封装)

但是 objective-c 有

NSConnection

NSURL

用来处理http请求 file请求 ftp请求 都是一些比较上层的应用层协议

NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];
        
        //2、创建请求(Request)对象(默认为GET请求)；
        NSURLRequest *requst = [[NSURLRequest alloc]initWithURL:url];
        
        //3、发送请求
        /*
         第一个参数:请求对象
         第二个参数:响应头
         第三个参数:错误信息
         返回值:NSData类型,响应体信息
         */
        NSError *error = nil;
        NSURLResponse *response = nil;
        //发送同步请求(sendSynchronousRequest)
        NSData *data = [NSURLConnection sendSynchronousRequest:requst returningResponse:&response error:&error];
        
        NSLog(@"connection data:%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
        NSLog(@"connection error:%@",error);

文件输入流

NSMutableData *data = [NSMutableData new];
        NSInputStream *inputStream = [NSInputStream inputStreamWithFileAtPath:@"/Users/dengfang/111.txt"];
        [inputStream open];
         NSLog(@"数据读取中...");
        while(1){
            uint8_t buf[1024];
            NSInteger readLength = [inputStream read:buf maxLength:1024];
            if (readLength > 0) {
                [data appendBytes:buf length:readLength];
            } else {
                NSLog(@"未读取到数据");
                break;
            }
        }
        NSLog(@"%@" ,[data base64EncodedStringWithOptions:nil]);
    }

文件输出流

NSOutputStream *ouputStream = [NSOutputStream outputStreamToFileAtPath:@"/Users/dengfang/222.txt" append:false];
[ouputStream open];
[ouputStream write:data.bytes maxLength:data.length];
[ouputStream close];

NSThread 为objective-c 的多线程对象

#import "Saler.h"

@implementation Saler

-(Saler*) init{
    self = [super init];
    NSLog(@"init saler");
    self.ticket = [NSNumber numberWithInt:20];
    return self;
}

-(void) startSale{
    NSThread *thread = [NSThread new];
    self->thread = thread;
    [thread initWithTarget:self selector:@selector(run) object:nil];
//该访问指明调用self.run 方法作为线程运行代码 
    [thread start];
}

-(void) run{
    NSLog(@"running");
}

@end

main 函数

#import <Foundation/Foundation.h>
#import "Saler.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Saler* saler1 = [Saler new];
        Saler* saler2 = [Saler new];
        [saler1 startSale];
        [saler2 startSale];
        NSLog(@"starting");
    }
    
   
    
    return 0;
}

console output

2023-04-02 20:58:33.568419+0800 CMD[2079:186178] init saler
2023-04-02 20:58:33.568662+0800 CMD[2079:186178] init saler
2023-04-02 20:58:33.569828+0800 CMD[2079:186178] starting
2023-04-02 20:58:33.570763+0800 CMD[2079:186233] running
2023-04-02 20:58:33.570776+0800 CMD[2079:186234] running
Program ended with exit code: 0

NSDate

NSDate *date = [NSDate new];  //默认为当前日期
//NSDate *date = [NSDate date];  //调用date方法也可以
NSLog(@"print date is %@",date);

dateFormat 格式化输出

   NSDateFormatter *formatter = [NSDateFormatter new];
        
   formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss z";
        
   //[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss z"];
   
   NSString *str = [formatter stringFromDate:date];
        
   NSLog(@"print date is %@",str);

dateFormat 反格式化

NSString *dateString = @"2023-04-02 11:33:04";
        
NSDateFormatter *formatter = [NSDateFormatter new];
        
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
NSDate *date = [formatter dateFromString:dateString];
        
NSLog(@"print date is %@",date);

objective-c有自己封装的集合类 字符串类 和 数字类 大多数有不可变和可变之分

NSData 二进制byte数组

NSValue C语言基本数据类型 结构体 的NS封装

NSString /NSMutableString 字符串类

NSNumber 基本数字类

NSDecimalNumber 高精度数字类

NSArray/NSMutableArray 数组

NSDictionary/NSMutableDictionary 字典

NSSet/NSMutableSet 无序集合

https://blog.csdn.net/pishum/article/details/125152886

解决苹果开发者账户 逾期问题 (xcode不允许编译)

苹果官方文档

https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html

NSLog 控制台输出

NSLog(NSString *format, …)

objective-c 文件系统依赖NSFileManager

objective-c file对象 为NSFileHandle

NSFileManager 返回的文件路径对象都是NSString

fileManager.currentDirectoryPath; //返回当前进程目录

BOOL isSuccess = [fileManager createFileAtPath:path contents:nil attributes:nil]; // 创建文件

 BOOL isDirectorySuccess = [fileManager createDirectoryAtPath:directory withIntermediateDirectories:true attributes:nil error:nil]; //创建文件夹

BOOL isRemoveSuccess = [fileManager removeItemAtPath:path error:nil];//删除文件或者文件夹

以下是读写文件文件 和文件对象操作

NSString 对应字符串

NSData 对应byte数组

NSFileHandle 对应文件对象

 NSString *homePath  = NSHomeDirectory( );
 NSString *sourcePath = [homePath stringByAppendingPathConmpone:@"testfile.text"];   
             
 NSFileHandle *fielHandle = [NSFileHandle fileHandleForUpdatingAtPath:sourcePath];   //创建文件对象
                    
 [fileHandle seekToEndOfFile];  将节点跳到文件的末尾  
        
 NSString *str = @"追加的数据"   
                
 NSData* stringData  = [str  dataUsingEncoding:NSUTF8StringEncoding];  
        
 [fileHandle writeData:stringData]; //追加写入NSData数据       
 [fileHandle closeFile]; //关闭文件对象

通过fileManager 在创建文件时写入NSData

NSString *content = @"content2";
NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
        BOOL isSuccess = [fileManager createFileAtPath:path contents:data attributes:nil];
        if (isSuccess) {
            NSLog(@"file created");
        }else{
            NSLog(@"file not created");
        }

通过NSMutableString 写入文件

   NSMutableString *content = [NSMutableString new];
        [content appendString:@"helloworld"];
        NSString *homePath = NSHomeDirectory();
        NSString *path = [homePath stringByAppendingPathComponent: @"myfile.txt"];

        BOOL isWriteSuccess = [content writeToFile:path atomically:true encoding:NSUTF8StringEncoding error:nil];
        if (isWriteSuccess) {
            NSLog(@"content writed");
        }else{
            NSLog(@"content not writed");
        }

通过NSData 写入文件

        NSString *content = @"helloworldNSdata2";
        NSString *homePath = NSHomeDirectory();
        NSString *path = [homePath stringByAppendingPathComponent: @"myfile.txt"];

        NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
        
        BOOL isWriteSuccess = [data writeToFile:path atomically:true];
        if (isWriteSuccess) {
            NSLog(@"content writed");
        }else{
            NSLog(@"content not writed");
        }
      

以下是流操作 NSInputStream和NSOutputStream

用文件流说明流章节比较复杂 下个章节单独说明