UIView 用法示例
? [UIView beginAnimations:nil context:nil];
??[UIView setAnimationDelay:0.8];
??[UIView setAnimationDuration:6.5];
??[UIView setAnimationCurve:UIViewAnimationCurveLinear];
??[UIView setAnimationWillStartSelector:@selector(yourmethod)];
??[UIView setAnimationDidStopSelector:@selector(yourmethod)];
??[UIView setAnimationDelegate:self];
??[_backgroundImage setCenter:CGPointMake(20,650)];
???[UIView commitAnimations];
