iOS - 网络语线程(OC)

1. 检测网络状态

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//获得网络检测结果

BOOL canConnectNetwork = [self isExistenceNetwork];

NSLog(@"Can connect network? --- %d",canConnectNetwork);

}

//检测网络状态

-(BOOL)isExistenceNetwork {

BOOL isExistenceNetwork;

//测试网络是否可以连接苹果官网.对于使用内购的朋友，可以用来检测是否可以连接苹果官网.

Reachability *r = [Reachability reachabilityWithHostName:@"http://www.apple.com"];

//对网络的连接状态进行遍历

switch ([r currentReachabilityStatus]) {

case NotReachable:

isExistenceNetwork = FALSE;         //表示网络不可用的状态

break;

case ReachableViaWWAN:

isExistenceNetwork = TRUE;          //表示当前网络通过2G或3G连接

case ReachableViaWiFi:

isExistenceNetwork = TRUE;          //表示当前网络通过WiFi连接

default:

break;

}

return isExistenceNetwork;

}

2. 同步Get方式的网络请求

//建立一个网址对象,指定请求数据的网址

NSURL *url = [NSURL URLWithString:@"http://www.apple.com"];

//通过网址,创建网络请求对象,Argument1:请求访问路径 Argument2:缓存协议 Argument3:网络请求超时

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

//使用网络连接对象,实现网络通信,网络连接对象创建成功后,就创建一个网络连接对象

NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

//将返回的数据,转成字符串

NSString *str = [[NSString alloc] initWithData:received encoding:NSUTF8StringEncoding];

NSLog(@"%@",str);

3. 异步Get方式的网络请求

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//建立一个网址对象,指定请求数据的网址,本节将调用Facebook的公用应用程序接口,获得某个用户的信息.

NSURL *url = [NSURL URLWithString:@"https://graph.facebook.com/Apple-Inc"];

//通过网址创建网络请求对象,Argument1:请求访问路径,Arguments:缓存协议 Arguments: 网络请求超时时间.

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

//使用网络请求对象实现网络通信,网络请求对象创建成功后,就创建了一个网络连接.

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

}

//添加一个代理方法,当接受到网络反馈时，执行这个方法

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(nonnull NSURLResponse *)response {

self.receiveData = [NSMutableData data];

}

//添加一个代理方法,当接受到网络数据时,执行这个方法

-(void)connection:(NSURLConnection *)connection didReceiveData:(nonnull NSData *)data {

self.receiveData = data;

}

............

4. 同步Post方式的网络请求

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//建立一个网址对象,指定请求数据的网址

NSURL *url = [NSURL URLWithString:@"http://www.apple.com"];

//再通过网址创建网络请求对象.Argument1:请求访问路径 Argument2:缓存协议 Argument3:网络请求超时时间

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

//设置网络通信方式为post,默认为GET.

[request setHTTPMethod:@"POST"];

//设置网络请求的参数

NSString *str = @"type=focus-c";

//将请求参数,转换为二进制数据

NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

[request setHTTPBody:data];

//使用网络连接对象实现网络的通信,网络连接对象创建成功后,就创建了一个连接

NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

//将返回的数据转成字符串

NSString *str1 = [[NSString alloc] initWithData:received encoding:NSUTF8StringEncoding];

NSLog(@"%@",str1);

}

5. 异步Get、Post方式的网络请求

6. 下载并保存网络图片

7. PerformSelector消息处理方法

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

IOSApp *app = [[IOSApp alloc] init];

//@selector()可以理解成取类方法的编号,它的行为基本可以等同C语言的中函数指针.它的结果是一个SEL类型.

SEL method = @selector(printInformation);

//首先判断对象是否存在,以某个名称命名的方法

if ([app respondsToSelector:method]) {

[app performSelector:method];

}

//然后调用对象的制定方法,这种方法的调用方式,是由运行时系统,负责去找对应的方法,在编译时候不做任何校验.

SEL method2 = @selector(buyApp:);

//执行带有参数的方法,传递相关的参数

if ([app respondsToSelector:method2]) {

[app performSelector:method2 withObject:(@"Photoshop Interactive Turorials")];

}

//在执行某个方法时,可以增加延迟执行的功能

[app performSelector:method2 withObject:(@"Photoshop Interactive Turorials") afterDelay:2];

}

8. 使用谷歌地图

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

[self openMaps];

}

//打开谷歌地图

-(IBAction)openMaps{

//定义个字符串,作为谷歌地图的当前地理位置

NSString *addressText = @"Beijing";

//请求的网址路径中,如果包含中文的话,会出现请求不成功的情况,这时需要将中文参数转为美国标准信息交换代码.

addressText = [addressText stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];

//定义一个完整的网址路径

NSString *urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@",addressText];

NSLog(@"urlText================ %@",urlText);

//获取应用程序的单例对象,然后调用对象的打开网址方法,打开指定路径的网址.

//    [[UIApplication sharedApplication] openURL:urlText];

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]

}

9. 发送邮件

10. NSRLoop延迟动作

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

CGRect rect = CGRectMake(100, 100, 100, 30);

UILabel *label = [[UILabel alloc] initWithFrame:rect];

[label setText:@"Waitting..."];

[label setTag:1];

[self.view addSubview:label];

//设置延迟1秒钟后,执行设定的方法.

[self performSelector:@selector(threadEvent) withObject:nil afterDelay:1.0f];

}

-(void)threadEvent {

//设置延迟2秒钟后,执行设定的方法.

[self performSelector:@selector(workInBackground) withObject:nil afterDelay:2.0f];

_stillLoading = true;

//是方法一直停留在本行,直到布尔值为假时,才跳转到下面的代码,以此实现线程的阻塞.

while (_stillLoading) {

[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]         ;

}

//延迟2秒钟后,隐藏文字标签

[[self.view viewWithTag:1] setHidden:YES];

}

-(void)workInBackground {

//标志线程运行状态

NSLog(@">>>>>>>>>>>>>>>>>>>>>>>>");

_stillLoading = false;

}

11. NSThread暂停动作

12. 使用多线程下载网络图片

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//创建一个包含图片网络路径的字符串.

NSString *url = @"http://images.apple.com/v/creativity-apps/a/images/icon_mac_garageband_2x.jpg";

//使用分离新线程选择器方法,创建一个线程,用来执行下载图片的方法.

[NSThread detachNewThreadSelector:@selector(downloadImage:) toTarget:self withObject:url];

}

-(void)downloadImage:(NSString *)url {

//初始化加载状态和可变二进制数据对象.

_isLoaded = NO;

_bufferData = [NSMutableData data];

//清除网络返回的缓存

[[NSURLCache sharedURLCache] removeAllCachedResponses];

//建立网络请求

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];

//建立网络请求的连接

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

if (connection != nil) {

while (!_isLoaded) {

//使方法一直停留在本行,直到布尔变量为假时,才跳到下面的代码,以此实现现成的阻塞

NSLog(@"Downloading........");

[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];

}

}

//跟新界面在主线程中,避免异常

//This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes.  This will cause an exception in a future release.

[[NSOperationQueue mainQueue] addOperationWithBlock:^{

//将请求返回的数据，转换为UIImage对象.

UIImage *img = [UIImage imageWithData:_bufferData];

UIImageView *imgview = [[UIImageView alloc] initWithImage:img];

//设置图像视图的中心点坐标

[imgview setCenter:CGPointMake(150, 200)];

[self.view addSubview:imgview];

}];

//清除网络请求对象与网络连接对象

request = nil;

connection = nil;

}

//添加代理方法,处理网络连接缓存事件,这里选择不缓存

-(NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {

return nil;

}

//添加一个代理方法,处理网络连接故障事件

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

[self performSelectorOnMainThread:@selector(httpConnectEndWitnError) withObject:self waitUntilDone:NO];

[_bufferData setLength:0];

}

//添加一个代理方法,处理接受网络数据事件。将返回的数据存入可变二进制数据对象.

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

[_bufferData appendData:data];

}

//添加一个代理方法,处理网络联结结束事件

-(void)connectionDidFinishLoading:(NSURLConnection *)connection {

[self performSelectorOnMainThread:@selector(httpConnectedEnd) withObject:nil waitUntilDone:NO];

//修改状态为真,退出线程阻塞.

self.isLoaded = YES;

}

//处理网络结束事件

-(void)httpConnectedEnd {

NSLog(@"httpConnetend");

}

//处理网络故障事件

-(void)httpConnectEndWitnError {

NSLog(@"httpConnectEndWithError");

}

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