简单实用的几行代码（ios开发知识小总结）

1.设置icon上的数字图标

//设置主界面icon上的数字图标，在2.0中引进， 缺省为0 [UIApplicationsharedApplication].applicationIconBadgeNumber = 4;1234

2.设置摇动手势的时候，是否支持redo undo操作

//摇动手势，是否支持redo undo操作。12

//3.0以后引进，缺省YES

[UIApplicationsharedApplication].applicationSupportsShakeToEdit =YES;12

3.判断程序运行状态

//判断程序运行状态，在2.0以后引入 /* UIApplicationStateActive UIApplicationStateInactive UIApplicationStateBackground */123456789101112

if([UIApplicationsharedApplication].applicationState ==UIApplicationStateInactive){

NSLog(@"程序在运行状态"); }1234

4.阻止屏幕变暗进入休眠状态

//阻止屏幕变暗，慎重使用 缺省为no 2.0 [UIApplicationsharedApplication].idleTimerDisabled =YES;1234

（慎重使用本功能，因为非常耗电）

5.显示联网状态

//显示联网标记 2.0 [UIApplicationsharedApplication].networkActivityIndicatorVisible =YES;123

6.在map上显示一个地址

NSString* addressText =@”1 Infinite Loop Cupertino CA 95014”;

// URL encode the spaces

addressText = [addressTextstringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];12

NSString* urlText = [NSStringstringWithFormat:@”http://maps.google.com/maps?q=%@“ addressText];

[[UIApplicationsharedApplication]openURL:[NSURLURLWithString:urlText]];12

7.发送电子邮件

NSString *recipients =@”mailto:first@example.com?cc=second@example.com third@example.com&subject=Hello from California!”;

NSString *body =@”&body=It is raining in sunny California!”;

NSString *email = [NSStringstringWithFormat:@"%@%@" recipients body]; email = [emailstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:email]];123456

8.打电话到一个号码

// Call Google 411 [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@"tel://8004664411"]];123

9.发送短信

// Text to Google SMS [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@"sms://466453"]];123

10.打开一个网址

// Lanuch any iPhone developers fav site

[[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@”http://itunesconnect.apple.com“]];