Is it possible to mask certain area of a view, so that content of that part became invisible/hidden.
I am using a web view and wanted to remove the top round corner of view, like below attached image -
Problem -
I want to remove/hide all the content which is below red area.
What I have tried -
I have tried to add a image view on top of web view and added a masking layer on top of it, but that doesn't seems to be working for me -
UIImageView *maskImage = [[UIImageView alloc] init];
maskImage.frame = CGRectMake(256, -10, 64, 64);
maskImage.image = [UIImage imageNamed:#"maskingImage"];
[self.webView addSubview: maskImage];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
CGRect maskRect = whitefoldMaskImage.frame;//CGRectMake(0, 0, 50, 100);
CGPathRef path = CGPathCreateWithRect(maskRect, NULL);
maskLayer.path = path;
CGPathRelease(path);
maskImage.layer.mask = maskLayer;
EDIT 1 --
As per suggestion of Mundi, I have tried opaque view on top of web view.
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(256, -10, 64, 64)];
view.opaque = YES;
[self.webView addSubview:view];
But that haven't worked too.
I have also gone through following threads on SO, but haven't found any solution -
CALayer: add a border only at one side
Simply mask a UIView with a rectangle
I want to remove/hide all the content which is below red area.
Simply add a opaque view above the area you want to hide. No need for a mask. E.g.
UIView *cover = [[UIView alloc] initWithFrame:topRightCornerFrame];
cover.backgroundColor = [UIColor whiteColor];
[webView addSubView:cover];
Related
I am adding the drop shadow like this.
vwVertical=[[UIView alloc] init];
[vwVertical setBackgroundColor:[UIColor whiteColor]];
vwVertical.translatesAutoresizingMaskIntoConstraints = NO;
vwVertical.layer.shadowColor=[UIColor colorWithRed:32/255 green:59/255 blue:90/255 alpha:1.0].CGColor;
vwVertical.layer.shadowOffset=CGSizeMake(5, 0);
vwVertical.layer.shadowOpacity=0.12;
vwVertical.layer.shadowRadius=6.5;
[vwBlock addSubview:vwVertical];
But this is adding shadow 3 sides. How can I add just to right side.
Please help me.
Thanks
All you need to do is to inset the view's bounds on top - left - bottom, and use the shadow path.
vwVertical=[[UIView alloc] init];
// Create edge insets
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 10, 0, 0);
// Create rect with inset and view's bounds
CGRect shadowPathOnlyIncludingRight = UIEdgeInsetsInsetRect(vwVertical.bounds, contentInsets);
// Apply it on the layer's shadowPath property
vwVertical.layer.shadowPath = [UIBezierPath bezierPathWithRect:shadowPathOnlyIncludingRight].CGPath;
[vwVertical setBackgroundColor:[UIColor whiteColor]];
vwVertical.translatesAutoresizingMaskIntoConstraints = NO;
vwVertical.layer.shadowColor=[UIColor colorWithRed:32/255 green:59/255 blue:90/255 alpha:1.0].CGColor;
vwVertical.layer.shadowOffset=CGSizeMake(5, 0);
vwVertical.layer.shadowOpacity=0.12;
vwVertical.layer.shadowRadius=6.5;
I have tried this code to draw a circle of rectangle
incNumberDefault=0;
for (int i = 0; i < maxNumber; i++) {
incNumberDefault = incNumberDefault +5;
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(incNumberDefault, 100, 3, 15)];
myView.center = CGPointMake(130,130);
myView.transform = CGAffineTransformMakeRotation(DegreesToRadians(incNumberDefault));
myView.backgroundColor = [UIColor lightGrayColor];
[self.speedDisplay addSubview:myView];
}
the outputs seems close circle where as i need transparent or space in middle of circle.
You can set UIView cornerRadius to half of the UIView width or height like,
myView.layer.cornerRadius=myview.frame.size.width / 2; or
myView.layer.cornerRadius=myview.frame.size.height / 2
For that you have to give same width and height to your UIView.
Try this :
// initialize the view with same height and width for perfect circle.
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 15, 15)];
// round the corner of view with required radius.
myView.layer.cornerRadius = myView.frame.size.width/2; // height can also be used
// circle with space in middle.
myView.backgroundColor = [UIColor clearColor];
myView.layer.borderColor = [UIColor lightGrayColor].CGColor;
myView.layer.borderWidth = 2.0f;
[self.speedDisplay addSubview:myView];
Hope it will solve your problem.
Thank you for your answer but i want to develop a dashed circle in certain distance and i have tired this code :
incNumberDefault=0;
for (int i = 0; i < maxNumber; i++) {
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(100+60 * sin(incNumberDefault), 100+60*cos(incNumberDefault), 3, 15)];
//myView.transform = CGAffineTransformMakeRotation(DegreesToRadians(incNumberDefault));
myView.backgroundColor = [UIColor lightGrayColor];
[self.speedDisplay addSubview:myView];
incNumberDefault = incNumberDefault +9;
}
but it generate random rectangle in a circle.
I want it in sequence.
Thank you.
I need to draw a rectangle on top of a UIButton. Assume that there's a UIButton called hideMe, and this button has 100x50 size. I want to place a 100x10 rectangle on top of this button every time a user receives a message. If the user receives five messages, then the button will be completely covered by the rectangles. How do I do this?
CALayer *topBorder = [CALayer layer];
topBorder.borderColor = [UIColor redColor].CGColor;
topBorder.backgroundColor = [UIColor blackColor].CGColor;
topBorder.borderWidth = 2;
topBorder.frame = CGRectMake(0, 15, <tempButton>.frame.size.width, <tempButton>.frame.size.height-30);
[<tempButton>.layer addSublayer:topBorder];
The above code helps you to draw the rectangle.You can increase the layer frames to cover full.
try this
#import <QuartzCore/QuartzCore.h>
here we are drawing our own border rect and sub viewing it to our button
-(UIView*)borderRectWithYvalue:(CGFloat)yValue
{
UIView * rect = [[UIView alloc] initWithFrame:CGRectMake(0,yValue, 100, 10)];
rect.backgroundColor = [UIColor lightGrayColor];
rect.layer.borderColor = (__bridge CGColorRef)([UIColor redColor]);
rect.layer.borderWidth = 2.0f;
return rect;
}
and call this method when and where you want to add border to your button with your custom y value
for ex
[yourButton addSubview:[self borderRectWithYvalue:10.0]];
I've done simple CALayer masks before but I think I'm getting confused on what they do. I'm trying to have a punch out effect with several (2) views.
Here's what I have so far. I'm looking to have a white square with punched out label and image (so you can see the brown background through it. Where am I going wrong?
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor brownColor];
self.viewToPunch = [[UIView alloc] initWithFrame:CGRectZero];
[self.view addSubview:self.viewToPunch];
self.viewToPunch.backgroundColor = [UIColor whiteColor];
self.punchLabel = [[UILabel alloc] initWithFrame:CGRectZero];
self.punchLabel.textColor = [UIColor blackColor];
self.punchLabel.font = [UIFont boldSystemFontOfSize:20.0];
self.punchLabel.text = #"punch";
self.punchLabel.textAlignment = NSTextAlignmentCenter;
self.punchImage = [[UIImageView alloc] initWithImage:[[UIImage imageNamed:#"plus"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]];
[self.punchImage setContentMode:UIViewContentModeCenter];
self.viewsToPunch = #[self.punchLabel,self.punchImage];
[self punch:self.viewToPunch withUIViews:self.viewsToPunch];
}
- (void)punch:(UIView *) viewToPunch withUIViews:(NSArray *)viewsToPunch
{
CALayer *punchMask = [CALayer layer];
punchMask.frame = viewToPunch.frame;
NSMutableArray *sublayers = [[NSMutableArray alloc] init];
for (UIView *views in viewsToPunch){
[sublayers addObject:views.layer];
}
punchMask.sublayers = sublayers;
punchMask.masksToBounds = YES;
viewToPunch.layer.mask = punchMask;
}
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
self.viewToPunch.frame = CGRectMake(50, 50, 100, 100);
self.punchLabel.frame = CGRectMake(0, 0, 100, 100);
self.punchImage.frame = CGRectMake(0, 0, self.viewToPunch.frame.size.width, 40.);
[self punch:self.viewToPunch withUIViews:self.viewsToPunch];
}
So not only do the frames seem to be off, it seems to be the opposite of a punch out. How do I invert the mask and fix up the frames?
Thanks a lot for any help! I put it in a method punch:withUIViews: so I can hopefully reuse it in other areas.
When you apply a mask to a CALayer, it only gets drawn in the parts where the mask is not transparent. But you're simply applying an empty (transparent) mask, with the wrong coordinates (which is why your view isn't completely transparent: the mask isn't covering the view completely; it should be punchMask.frame = viewToPunch.bounds;)
You might want to look into CAShapeLayer and assign it a path. Use that as mask layer.
For example, see CAShapeLayer mask view or Getting Creative with CALayer Masks (cached blog post).
I tried to combine mask of CAGradationLayer and CAShapeLayer, and It is possible.
https://stackoverflow.com/a/32220792/3276863
I'm trying to do the following thing -
I have two version of the same image, one colored and one black and white. I want the B&W to "Slide up" revealing the one under it.
I tried setting the height and the frame, but couldn't get it to work like I want it to.
For example , this would be a combination of both UIImages where one is revealing the other, while not moving:
Any ideas? :)
OK, here is a different method using a mask on the grey view. I actually tested this with a blueView and a greyView, where the grey covers up the blue. Put a mask layer on the grey layer so that the grey layer is visible. Now animate the mask away from the grey layer, making the grey layer disappear without moving it, the blue shows thru where the grey disappears.
If you want to experiment with this, create an empty project in XCode with a single view, and put this code inside viewDidLoad. That's how I tested this.
self.view.backgroundColor = [UIColor whiteColor];
UIView* blueView = [[[UIView alloc] init] autorelease];
blueView.backgroundColor = [UIColor blueColor];
blueView.frame = CGRectMake(50,50,100,100);
UIView* grayView = [[[UIView alloc] init] autorelease];
grayView.backgroundColor = [UIColor grayColor];
grayView.frame = CGRectMake(50,50,100,100);
[self.view addSubview:blueView];
[self.view addSubview:grayView]; // gray covers the blue
// Create a mask to allow the grey view to be visible and cover up the blue view
CALayer* mask = [CALayer layer];
mask.contentsScale = grayView.layer.contentsScale; // handle retina scaling
mask.frame = grayView.layer.bounds;
mask.backgroundColor = [UIColor blackColor].CGColor;
grayView.layer.mask = mask;
// Animate the position of the mask off the grey view, as the grey becomes unmasked,
// that part of the grey "dissappears" and is no longer covering the blue underneath
CABasicAnimation* a = [CABasicAnimation animationWithKeyPath:#"position"];
a.duration = 4;
a.fromValue = [NSValue valueWithCGPoint:mask.position];
CGPoint newPosition = mask.position;
newPosition.y += mask.bounds.size.height;
a.toValue = [NSValue valueWithCGPoint:newPosition];
a.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
[mask addAnimation:a forKey:#"colorize"]; // animate presentation
mask.position = newPosition; // update actual position
Don't forget this line at the top with the #imports:
#import <QuartzCore/QuartzCore.h>
One way is to stack the UIView's so that the B&W image on top of the color image, where the color image is completely covered (hidden) by the B&W image.
[self.view insertSubview:bwImage aboveSubview:colorImage];
Only the B&W view is visible. Now set clipsToBounds on the B&W view:
bwImage.clipsToBounds = YES;
Finally animate the height in the bounds of the bwImage so that its height shrinks down to 0, clipping the B&W image and revealing the color image behind it. Something like this:
[UIView animateWithDuration:1.0 animations:^{
CGRect b = bwImage.bounds;
b.size.height = 0;
bwImage.bounds = b;
}];
I haven't tried this but hopefully you get the idea.