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1、升级Ruby环境终端输入：$gem update --system此时会出现ERROR: While executing gem ... (Gem::FilePermissionError)You don‘t have write permissions for the /Library/Rub... 阅读全文
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- (IBAction)StartDownLoad:(UIButton *)sender { //NSString *urlstr = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSStrin... 阅读全文
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- (IBAction)login:(UIButton *)sender { NSString *username = self.usrnameTextField.text; NSString *password = self.pwdTextField.text; NSString *u... 阅读全文
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- (IBAction)getbigfile:(UIButton *)sender { NSString *str = @"http://b.hiphotos.baidu.com/video/pic/item/e850352ac65c1038698cd94eb7119313b17e894f.j... 阅读全文
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NSString *urlStr =[NSString stringWithFormat:@"http://qzone.qq.com/login?username=%@&pwd=%@",username,password];urlStr = [urlStr stringByAddingPercent... 阅读全文
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准备URL NSString *urlStr = self.textField.text;根据URL来准备一个请求对象 NSURL *url = [NSURL URLWithString:urlStr];发送请求 NSURLRequest *request = [NSURLRequest reque... 阅读全文
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概念:如何将NSString转化成NSData(将字符串转化成二进制数据)NSString *str = @"ABCDE"; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; NSLog(@"%d",data.len... 阅读全文
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- (IBAction)blockQueue:(UIButton *)sender { NSOperationQueue *queue = [[NSOperationQueue alloc]init]; NSBlockOperation * operation = [NSBloc... 阅读全文
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创建NSOperationQueue 对象NSOperationQueue *queue = [[NSOperationQueue alloc]init];创建NSInvocationOperation对象NSInvocationOperation *operation = [[NSInvocati... 阅读全文