1.本地通知，应用按HOME退出到后台，10秒后本地发起通知。（类似于push通知）
UILocalNotification *notification=[[UILocalNotification alloc] init];
if (notification!=nil) {
NSLog(@">> support local notification");
NSDate *now=[NSDate new];
notification.fireDate=[now addTimeInterval:10];
notification.timeZone=[NSTimeZone defaultTimeZone];
[email protected]"该去吃晚饭了！";
[[UIApplication sharedApplication].scheduleLocalNotification:notification];
}
2.判断邮箱输入是否正确。
- (BOOL) validateEmail: (NSString *) candidate {
NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:candidate];
}
3.如何保存当前视图到相册。
#import <QuartzCore/QuartzCore.h>
UIGraphicsBeginImageContext(currentView.bounds.size); //currentView 当前的view
[currentView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);