学步园

            UIKeyboard.Notifications.ObserveDidShow ((s,e)=>{
                RectangleF kbdBrounds = e.FrameEnd;
            });

            UIKeyboard.Notifications.ObserveWillHide ((s,e)=>{

                RectangleF kbdBrounds = e.FrameEnd;

            });

系统线程睡眠

System.Threading.Thread.Sleep(1000);

定时器妙用

            int i = 0;
            NSTimer timer=null;
            IssueBlog.Hidden = false;
            IssueBlog.Layer.AddAnimation(animate,"transform.translation.y");
            timer = NSTimer.CreateRepeatingScheduledTimer (0.1, () => {

                switch(i){
                case 0:
                    IssueDailyRecord.Hidden=false;
                    IssueDailyRecord.Layer.AddAnimation(animate,"transform.translation.y");
                    i++;
                    break;
                case 1:
                    freeButton.Hidden=false;
                    freeButton.Layer.AddAnimation(animate,"transform.translation.y");

                    i++;
                    break;
                case 2:
                    IssueJourney.Hidden=false;
                    IssueJourney.Layer.AddAnimation(animate,"transform.translation.y");
                    i++;
                    break;
                default:
                    timer.Invalidate ();
                    break;
                }
            });

计算字符串尺寸

                    NSString str = new NSString (cellObj ["issueBlogContent"].ToString ());
                    SizeF strSize = str.StringSize (UIFont.BoldSystemFontOfSize (16.0f));