Question

我有一个带有calloutAccessoryControl的MKAnnotation。按下时，我显示一个UIView：

-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
NSDate *start = [NSDate date];

DLog(@"fired");
DLog(@"thread: %@", [NSThread currentThread]);

EntityPoint *entityPoint = (EntityPoint *)view.annotation;

EntityFormView *entityFormView = entityPoint.entityFormView;

DLog(@"addind subview: %f", [[NSDate date] timeIntervalSinceDate:start]);

[self.view addSubview:entityFormView.screenView];

DLog(@"addind constraints: %f", [[NSDate date] timeIntervalSinceDate:start]);

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[screenView]|" options:0 metrics:nil views:@{@"screenView": entityFormView.screenView}]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[screenView]|" options:0 metrics:nil views:@{@"screenView": entityFormView.screenView}]];

DLog(@"finished , doing animation: %f", [[NSDate date] timeIntervalSinceDate:start]);

[UIView animateWithDuration:.1
                 animations:^{
                     entityFormView.screenView.alpha = 1;
                 }
                 completion:^(BOOL finished) {
                     DLog(@"completely finished: %f", [[NSDate date] timeIntervalSinceDate:start]);
                 }];

}

我第一次运行此代码时，它发生在〜.2秒内。我关闭它然后重新打开它需要~1.2秒：

 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | fired
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | thread: <NSThread: 0x1d548bc0>{name = (null), num = 1}
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | addind subview: 0.005463
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | addind constraints: 0.047544
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | finished , doing animation: 0.049323
 DEBUG | __74-[MapViewController mapView:annotationView:calloutAccessoryControlTapped:]_block_invoke1001 | completely finished: 0.199709

 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | fired
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | thread: <NSThread: 0x1d548bc0>{name = (null), num = 1}
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | addind subview: 0.006285
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | addind constraints: 1.069605
 DEBUG | -[MapViewController mapView:annotationView:calloutAccessoryControlTapped:] | finished , doing animation: 1.082836
 DEBUG | __74-[MapViewController mapView:annotationView:calloutAccessoryControlTapped:]_block_invoke1001 | completely finished: 1.194132

当我删除UIView时：

-(void)removeForm {
    [UIView animateWithDuration:.1
                     animations:^{
                         self.screenView.alpha = 0;
                     }
                     completion:^(BOOL finished) {
                         [self.screenView removeFromSuperview];
                     }];
}

为什么在第一次使用这么长时间后添加subView？ /折流

Answer 1

它有点像第一次运行，alpha动画没有发生，这很奇怪。在completely finished日志之后，您的完成doing animation日志应加上大约1秒的时间戳。我会说开始在那里进行调查，因为这是事件序列中看起来不正确的第一件事。也许当它第一次运行时，UIView的alpha已经是1.0，所以它不会淡入？

Answer 2

我玩弄它并在解决我遇到的另一个问题时，我也解决了这个问题。

表单视图是一个子类UIScrollView，要关闭视图，您需要向下滚动才能单击“保存”按钮。这会导致contentOffset设置为145.关闭后，我将contentOffset设置为0.这解决了我的慢显示问题。

我最好的猜测是UIScrollView动画到偏移，而alpha仍为0.一旦它动画到偏移量，它会将alpha动画设为1。

使用约束添加子视图需要1秒钟才能显示

2 个答案: