摘要： 方法1:SELECT OBJECT_name(id) name,ROWS FROM sysindexes order by rows desc注：当数据量超过2147483648 ( 2^31)时，上面查询得到的数据会溢出。因为sysindexes的rows为int类型。方法2: EXEC sp_spaceused N'表名'; 阅读全文

摘要： EXEC sp_spaceused N'表名';name rows reserved data index_size unused--------------------------------------------------------------------------------------------表名 1738729349 458695896 KB 251704912 KB 172157176 KB 34833808 KB各字段计算关系：reserved ＝data +index_size +un... 阅读全文

摘要： -(BOOL) isEmptyString:(NSString*) string { if([string length]==0){//string is empty or nil return YES; }elseif([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0){ //string is all whitespace return YES; } return NO;} 阅读全文

摘要： http://de77.com/php/how-to-detect-visitors-country-using-his-ip-address关键知识点：1，IP地址转换成10进制计算公式 1.2.3.4 = 4 + (3 * 256) + (2 * 256 * 256) + (1 * 256 * 256 * 256) 14.155.114.41 ＝41 + (114 * 256) + (155 * 256 * 256) + (14 * 256 * 256 * 256) ＝245068329 也可直接通过http://whatismyipaddress.com/ip/14.155.114.41 阅读全文

摘要： UsingJSONin Cocoa is simple thanks to an excellentopen-source JSON Framework by Stig Brautaset. The framework will decode a JSON string into native Objective-C objects, and vice versa . The project includes a packaged Framework, Mac and iPhone SDKs, as well as the source code. The easiest method is 阅读全文

摘要： 1，如何把XCode中建模结果导出类定义文件 打开Contacts.xcdatamodel文件，选中要导出的类，点击File-New File, 在新建窗口中选择Managed Object Class2,怎样在建模中定义NSArray最好的办法是把它定义为一对多的关系参考：http://stackoverflow.com/questions/1104075/saving-an-nsmutablearray-to-core-data3, 修改Model后，再运行程序报如下错误：The model used to open the store is incompatible with the o 阅读全文

摘要： 最终效果图：主界面：- (void)viewDidLoad{ [super viewDidLoad]; UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, searchBarHeight)]; searchBar.delegate = self; self.tableView.tableHeaderView = searchBar; [searchBar release]; }- (NSIn... 阅读全文

摘要： http://blog.mugunthkumar.com/coding/iphone-tutorial-how-to-send-in-app-sms/ 阅读全文

摘要： Static methods neither require an instance of the class nor can they implicitly access the data (or this, self, Me, etc.) of such an instance.This describes exactly what Objective-C's class methodsare not.An Objective-C class method very much requires an instance that is the target of the method 阅读全文

摘要： UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"您是否真的要发邮件给他?" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Yes" otherButtonTitles:nil]; [actionSheet showInView:self.view]; [actionSheet... 阅读全文