用NSTimer推动UILabel上行

Question

全部， 我想将UILabel向上移动5秒并隐藏起来。 我们在游戏中看到的东西，当我们得到什么的时候， 文字出现，向上移动说“+300”等等。

如何移动UIlabel？ 问候

Answer 1

查看UIView animation methods

即

- (void)showScoreLabelFor:(int)score {
    // Make a label
    UILabel *scoreLabel = [UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 100)] autorelease];

    // Set it's text to the score we want to show
    [scoreLabel setText:[NSString stringWithFormat:@"%+i", score]];

    // Center it in the view
    [scoreLabel sizeToFit];
    [scoreLabel setCenter:CGPointMake([[self view] center].x, 200)];

    // Add it to the view
    [[self view] addSubview:scoreLabel];

    // Animate it up 100 pixels ver 2 seconds
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2.0];
    CGRect frame = [scoreLabel frame];
    frame.origin.y -= 100;
    [scoreLabel setFrame:frame];
    [UIView commitAnimations];
}