漂亮的下落式动画载入视图
- (IBAction)changePassWord:(id)sender
{
CGSize size = [[UIScreen mainScreen] bounds].size;
//增加半透明层
bgView = [[UIView alloc]initWithFrame:self.view.frame];
bgView.backgroundColor = [UIColor colorWithWhite:0.2 alpha:0.7];
[self.parentViewController.view addSubview:bgView];
//把修改密码窗口加到父视图上,因为UITableView没法直接加subview。给窗口一个初始化的旋转角度。
self.changePWD = [[self storyboard]instantiateViewControllerWithIdentifier:@"ChangePassWordID"];
self.changePWD.delegate = self;
[self.changePWD.view setFrame:CGRectMake(0, -200, 280, 200)];
[self.changePWD.view setTransform:CGAffineTransformMakeRotation(-M_PI / 20)];
[self.parentViewController.view addSubview:self.changePWD.view];
//动画载入密码窗口
[UIView animateWithDuration:0.3 animations:^{
[self.changePWD.view setTransform:CGAffineTransformMakeRotation(0)];
[self.changePWD.view setFrame:CGRectMake(20, size.height/2-100, 280, 200)];
}];
//给窗口增加拖动手势
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panPaswordView:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[self.parentViewController.view addGestureRecognizer:panRecognizer];
}
-(void)panPaswordView:(id)sender {
[self.view bringSubviewToFront:[(UIPanGestureRecognizer*)sender view]];
CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];
//拖动开始时记录浮动窗口的中心点
if ([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {
firstX = self.changePWD.view.center.x;
firstY = self.changePWD.view.center.y;
}
//获取拖动后的坐标
translatedPoint = CGPointMake(firstX, firstY+translatedPoint.y);
//禁止往上拖动
if (translatedPoint.y < firstY) {
return;
}
//在拖动时即时更新窗口位置
[self.changePWD.view setCenter:translatedPoint];
//拖动结束时关闭密码窗口，并移除附加的手势
if ([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
[self removePasswordView];
[self.parentViewController.view removeGestureRecognizer:(UIPanGestureRecognizer*)sender];
}
}
- (void)removePasswordView
{
[UIView animateWithDuration:0.5 animations:^{
[self.changePWD.view setFrame:CGRectMake(20, 1136, 280, 200)];
bgView.alpha = 0.0;
} completion:^(BOOL finished) {
[self.changePWD.view removeFromSuperview];
[bgView removeFromSuperview];
}];
}