Align UIImageView to bottom of UIScrollView

Question

I want to align the red image at the bottom of the scroll. In portrait orientation, it looks great, since the scroll height is equal to the viewing height.

But in landscape mode it looks like when in landscape I want it to be completely hidden until the user scrolls to the bottom of the scroll, so that the red image is always at the bottom of the scroll. Currently it looks in landscape mode.

I added a red image as a scrollview subquery and applied basommarginautoresizingmask to it.

Answer 1

autoresizing, left, right, bottom flexibleWidth UIImageView, UIScrollView. .

UIScrollView , it, UIImageView , .

, .

:

Answer 2

Autoresizingmask , . AutoLayout translatesAutoresizingMaskIntoConstraints , . YES , . . AutoLayout, . AutoLayout .

, , IB. AutoLayout . . . . . IB, , . IBOutlet, . , . :

@interface ViewController ()

@property (nonatomic, weak) UIImageView *imageView; // the image view
@property (nonatomic, weak) NSLayoutConstraint *imageBottomToScrollView; // the constraint you added in IB to the image view

@end

@implementation ViewController


- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
    UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(orientation)) {
        self.imageBottomToScrollView.constant = -CGRectGetHeight(self.imageView.frame);
    } else if (UIDeviceOrientationIsPortrait(orientation)) {
        self.imageBottomToScrollView.constant = 0;
    }
}


@end

~

Answer 3

.

-(void)viewWillLayoutSubviews
{
    [super viewWillLayoutSubviews];
    CGSize contentSize = self.scrollView.contentSize;
    CGRect frame = self.imageView.frame;
    frame.origin.x = 0;
    frame.size.width = self.scrollView.frame.size.width;
    frame.size.height = Expected_Height;
    frame.origin.y = contentSize.height - frame.size.height;
    self.imageView.frame = frame;
}

Answer 4

Autoresizingmask , IB, , .

Answer 5

IB, . , , , screen_height + abs(tabbar_height - imageview_height).

Answer 6

uiimageview scrollview, . ,