UIApplicaiton常用功能
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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;
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判断程序运行状态
? ?if([UIApplicationsharedApplication].applicationState ==UIApplicationStateInactive){
? ? ? ? NSLog(@"程序在运行状态");
? ? }
阻止屏幕变暗进入休眠状态
? ? [UIApplicationsharedApplication].idleTimerDisabled =YES;
（慎重使用本功能，因为非常耗电）
在map上显示一个地址
? ?NSString* addressText =@"1 Infinite Loop, Cupertino, CA 95014";
? ?// URL encode the spaces
? ? addressText = ?[addressTextstringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
? ?NSString* urlText = [NSStringstringWithFormat:@"http://maps.google.com/maps?q=%@", addressText];
? ? [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:urlText]];
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]];
打电话到一个号码
? ? // Call Google 411
? ? [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@"tel://8004664411"]];
发送短信
? ? // Text to Google SMS
? ? [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@"sms://466453"]];
打开一个网址
? ?// Lanuch any iPhone developers fav site
? ? [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:@"http://itunesconnect.apple.com"]];
