i have picture like this image it will present on Landscape Mode
so if rotate device to Portrait, how to present image like this
Use an UIImageView with these settings:
imageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleHeight);
imageView.contentMode = UIViewContentModeScaleAspectFit;
It looks like what you're trying to do is clip the image on the right, while leaving the top, left, and bottom the same.
Two things to try:
1) Subclass UIView and in the drawRect method, adjust the rect and draw out the clipped image using CGContextDrawImage (context, rect, sourceImage.CGImage).
2) Use CALayers. You can adjust the 'contentsRect' of the imageView's layer:
CALayer* imageLayer = imageView.layer;
imageLayer.masksToBounds = YES;
CGRect rect;
if (inPortrait)
rect = CGRectMake(0.0, 0.0, 0.5, 1.0); // half size
else
rect = CGRectMake(0.0, 0.0, 1.0, 1.0); // full size
imageLayer.contentsRect = rect;
This slices the image in half along width. masksToBounds takes care of clipping sublayers (in case you have them). You can tweak the contentsRect unit rectangle to adjust where you want the cutoff. You may also want to adjust the imageView's own bounds as well to match the size.
This has an added bonus in that adjusting the contentsRect is automatically animated so when you do the rotation the width animates in and out nicely.
// Set the layer contents
view.layer.contents = [image CGImage];
// Stretch so that contents overflows the edges and keeps aspect ratio
view.layer.contentsGravity = kCAGravityResizeAspectFill;
// Clip off the overflow
view.layer.masksToBounds = YES;
// Set the frame
CGRect frame;
frame.origin = CGPointZero;
frame.size = view.superview.bounds.size;
view.frame = frame;
// Make sure it resizes when the superview does
view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
You will have to work with view's layer.
You can find the appropriate guidelines at https://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/CoreAnimation_guide/Articles/Layers.html
Hope this helps.
Thanks,
Jim.
Related
I have UIImageView in which I'm showing 50x100 image.
I want to show only a part of image 50x50 (top part)?
How can I do that?
The very simple way to move big image inside UIImageView as follows.
Let we have the image of size (100, 400) representing 4 states of some picture one below another. We want to show the 2nd picture having offsetY = 100 in square UIImageView of size (100, 100).
The solution is:
UIImageView *iView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
CGRect contentFrame = CGRectMake(0, 0.25, 1, 0.25);
iView.layer.contentsRect = contentFrame;
iView.image = [UIImage imageNamed:#"NAME"];
Here contentFrame is normalized frame relative to real UIImage size.
So, "0" means that we start visible part of image from left border,
"0.25" means that we have vertical offset 100,
"1" means that we want to show full width of the image,
and finally, "0.25" means that we want to show only 1/4 part of image in height.
Thus, in local image coordinates we show the following frame
CGRect visibleAbsoluteFrame = CGRectMake(0*100, 0.25*400, 1*100, 0.25*400)
or CGRectMake(0, 100, 100, 100);
You can crop the image by using CGImageCreateWithImageInRect, which is Quartz primitive working on CGImageRef, so you would have something like:
CGImageRef imageRef = CGImageCreateWithImageInRect(originalImage.CGImage, cropRect);
UIImage* outImage = [UIImage imageWithCGImage:imageRef scale:originalImage.scale orientation:originalImage.imageOrientation]];
CGImageRelease(imageRef);
When calculation cropRect, keep in mind that it should be given in pixels, not in points, i.e.:
float scale = originalImage.scale;
CGRect cropRect = CGRectMake(0, 0,
originalImage.size.width * scale, originalImage.size.height * 0.5 * scale);
where the 0.5 factor accounts for the fact that you want the top half only.
If you do not want to go low-level, you could add your image to a UIView as a background color and use the clipToBounds CALayer property to make the clipping:
myView.backgroundColor = [UIColor colorWithBackgroundPattern:myImage];
myView.layer.clipToBounds = YES;
also, set myView bounds accordingly.
I might have a solution for you. See if this works. In Interface Builder there is an option about Image content fill properties. You can set it to top-left. Follow the image in interface builder -
After this set the size of UIImageView to 50x50 with "clip-subviews" checked...
I'm adding a shadow to my view layer like so:
self.view.layer.shadowOffset = CGSizeZero;
self.view.layer.shadowOpacity = 0.10f;
self.view.layer.shadowRadius = 5.0f;
self.view.layer.shadowColor = [UIColor blackColor].CGColor;
self.view.layer.shadowPath = [UIBezierPath bezierPathWithRect:
CGRectMake(self.view.bounds.origin.x, self.view.bounds.origin.y, self.view.bounds.size.width - 5.0, self.view.bounds.size.height)].CGPath;
self.view.clipsToBounds = NO;
What I want to do is somehow clip the shadow so that it does not extend beyond the width, but does extend beyond the height. Basically, I just want a 90 degree shadow rather than a shadow all around my bounds. I tried subtracting the shadowRadius amount from the bezierRect width, but this messes up the shadow flow on the bottom a little bit.
Any ideas how this can be accomplished?
You can add a new "container" view and add your view (the content view) as a subview. The container view should be higher than your view but the same width. If you set your container view to clip to its bounds it will clip the shadows on the side but allow shadows on the bottom and top.
_________
| _______ | <-- container
|| ||
|| || <-- your view (inside container)
||_______||
|`````````| <-- shadow of your view (inside container)
|_________|
In code this would look something like
// contentView is already created and configured...
UIView *containerView = [[UIView alloc] initWithFrame:
CGRectInset([contentView frame],
0, // keep the same width
-radius)]; // increase the height
[[self view] addSubview:containerView];
[contentView setCenter:CGPointMake(CGRectGetMidX([contentView bounds]),
CGRectGetMidY([contentView bounds]));
[containerView addSubview:contentView];
[containerView setClipsToBounds:YES];
I want to clip an UIImageView if it moves out of given rect.
The image is moving across the screen by setting the frame, but I need to clip it when it moves out of a given fixed rect (say (0,0,650,650)).
If you only want to show the center of the image an a UIImageView set the content mode to "Aspect Fill" via IB. That will center it and crop off anything extra.
Or in code
myImageView.contentMode = UIViewContentModeScaleAspectFill;
or
Subclass UIView and in the drawRect method, adjust the rect and draw out the clipped image using CGContextDrawImage (context, rect, sourceImage.CGImage).
or
Use CALayers. You can adjust the 'contentsRect' of the imageView's layer:
CALayer* imageLayer = imageView.layer;
imageLayer.masksToBounds = YES;
CGRect rect;
if (inPortrait)
rect = CGRectMake(0.0, 0.0, 0.5, 1.0); // half size
else
rect = CGRectMake(0.0, 0.0, 1.0, 1.0); // full size
imageLayer.contentsRect = rect;
Did you try using the property clipsToBounds of UIView and setting it to YES as it says in Reference that
Setting this value to YES causes subviews to be clipped to the bounds of the receiver
UPDATE
See if this SO question helps you
Proper use of UIRectClip to scale a UIImage down to icon size
myImageView.contentMode = UIViewContentModeCenter;
Try this.
I have a UIImageView whose frame, set before the image is loaded, is always too large for the image, so when I try to round the corners, for example, nothing happens.
How can I resize the frame so it's the same size as the underlying image, while ensuring that the center point of the UIImageView does not change?
If you change the bounds of a UIView the center will not change.
CGRect bounds;
bounds.origin = CGPointZero;
bounds.size = newImage.size;
imageView.bounds = bounds;
imageView.image = newImage;
try something along the following lines.. not tested
CGSize imageSize = image.Size;
CGPoint oldCenter = imageView.center;
// now do some calculations to calculate the new frame size
CGRect rect = CGRectMake(0, 0, imageSize.width, imageSize.height);
imageView.frame = rect;
imageView.center = oldCenter;
I've read various posts on here asking similar questions... I've tried various ways that were posted including bounds and frames etc. including the following:
myImage.frame = CGRectMake(0.0f, 0.0f,50.0f, 50.0f);
and:
myImage.bounds = CGRectMake(0.0f, 0.0f,50.0f, 120.0f);
neither of those work.
However, I find it interesting that the following code let's me move the Image around but doesn't change the width:
CGRect frameRect = myImage.frame;
frameRect.size.width = 50.0f;
frameRect.origin.x += 10.5f;
myImage.frame = frameRect;
So why don't any of these change the width/height of my ImageView?
I found another post on here that basically states I have to right a small book of code to get it resize my image... is that true?
Such as this one:
UIImage: Resize, then Crop
certainly this is simpler than that??
The following will change the size of the UIImaveView, clipping the underlying image without resizing it and keeping it aligned to bottom left of view:
imageView.frame = CGRectMake(
imageView.frame.origin.x,
imageView.frame.origin.y, newWidth, newHeight);
imageView.contentMode = UIViewContentModeBottomLeft; // This determines position of image
imageView.clipsToBounds = YES;
First off, you can't set the frame or bounds of the UIImage - that will only work on a UIImageView.
I've found that changing the frame of a UIImageView causes the Image to be scaled to the new size. Sometimes, that's undesirable - and you want instead to crop the image.
I can't tell if this is what you're asking for, but here's some code to crop an image to a specific size in a UIImageView:
UIImage *myImage = [UIImage imageNamed:#"photo.png"];
CGRect cropRect = CGRectMake(0.0, 0.0, 320.0, 44.0));
CGImageRef croppedImage = CGImageCreateWithImageInRect([myImage CGImage], cropRect);
UIImageView *myImageView = [[UIImageView alloc] initWithFrame:cropRect];
[myImageView setImage:[UIImage imageWithCGImage:croppedImage]];
CGImageRelease(croppedImage);
From what I get of the question, the OP wanted to change the size of the UIImageView when the size of the container UIView is changed. The code below will do it...
UIView * foo = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 25, 25)] autorelease];
foo.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
UIImageView * bar = [[UIImageView alloc] initWithImage:
[UIImage imageNamed:#"test.png"]];
bar.autoresizingMask = foo.autoresizingMask;
[foo addSubview:bar];
[self.view addSubview:foo];
The key here are the foo.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight and the bar.autoresizingMask = foo.autoresizingMask; lines. Forget either of these, and the whole jigmarole will stop working.
Well, if your read the documentation about UIIMage you can notice that is impossible to change any parameter of an UIImage after create it, the solution I've implemented for use high quality images for change some parameter of (for example) the SliderControl as Screw Image, is the next one:
UIImage *tumbImage= [UIImage imageNamed:#"screw.png"];
UIImage *screw = [UIImage imageWithData:UIImagePNGRepresentation(tumbImage) scale:2];
With that, I can to use 100x100 px image in my apps scaled to 50%.
Kind regards.
Try Using a UIScrollView. Add the UIImageView to the UIScrollView in Interface Builder you can then control the position and size of the image as follows:
CGRect rect = [scrollView frame];
rect.origin.x = 50.0f;
rect.origin.y = 0.0f;
rect.size.width = 320.0f;
rect.size.height = 150.0f;
[scrollView setFrame:rect];
If you tried those methods cannot work, the only way to do it is to add the constraint of width and height to the UIImageView.
// Create the constraint in code
NSLayoutConstraint *constraint0 = [NSLayoutConstraint constraintWithItem: myImage attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeWidth multiplier:1.0f constant: yourNewsWidth];
NSLayoutConstraint *constraint1 = [NSLayoutConstraint constraintWithItem: myImage attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1.0f constant: yourNewsHeight];
[myImage addConstraint:constraint0];
[myImage addConstraint:constraint1];
Use myImageView.frame = myNewPosAndSize; to resize or reposition your image view (as with any other view). It might confuse you that the image view draws its image with its original size, possibly exceeding its own dimensions. To disable this use myImageView.clipsToBounds = NO;
You don't have to write a whole book, you can copy that code.
I believe the UIImageView always draws the image at 0,0 at a 1.0 scale. You'll need to resize the image if you want to continue using the UIImageView.