In my table, I'm currently setting the background of the cells as an image like so:
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Placeholder.png"]];
However, the white text that overlays this image in the cell is hard to read, so I'd like to add a dimming effect to it.
As far as I know, the closest thing that's available is UIBlurEffectStyleLight, but this blurs rather than dims, and the blur effect is too strong, making the image barely visible. Is there a way to dim it instead?
You might want to add a UIView between the image and the text, then give it a black background colour and set its alpha to like 0.3 or an appropriate amount
Reduce the alpha of the imageView
cell.backgroundView.alpha = 0.5; //Alpha runs from 0.0 to 1.0
Related
I want to blend two UIImages as Fused App is doing:
https://itunes.apple.com/us/app/fused-double-exposure-video/id869117407?mt=8
What Fused is doing, it takes two images (foreground & background) and apply blending in such a way that background remains the same and user can move,rotate & size the foreground image. I attached two images for better understanding. I want to achieve the same behaviour in my app. I have tried all CoreImage & CoreGraphics but I could not achieve this. Help needed from all of you.
First Screen: After applying Overly blend mode.
Second Screen: Change the size of foreground image:
My Result:
You can achieve what you want by using CHTStickerView, I've used it before and it works great. CHTStickerView is a movable, resizable, rotatable UIView with one finger, which is fully customizable.
Use CHTStickerView as your foreground image and UIImageView as your background image.
So your code should look something like this:
- (void)viewDidLoad {
[super viewDidLoad];
//background
UIImageView *backgroundImageView = [[UIImageView alloc] initWithFrame:self.view.frame];
[backgroundImageView setImage:#"background.png"];
[self.view addSubview:backgroundImageView];
//foreground
UIImageView *foregroundImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 150, 150)];
[foregroundImageView setImage:[UIImage imageNamed:#"foreground.png"]];
CHTStickerView *stickerView = [[CHTStickerView alloc] initWithContentView:foregroundImageView]; //set your foreground image as content in CHTStickerView
stickerView.center = self.view.center;
stickerView.delegate = self;
[stickerView setImage:[UIImage imageNamed:#"Close"] forHandler:CHTStickerViewHandlerClose];
[stickerView setImage:[UIImage imageNamed:#"Rotate"] forHandler:CHTStickerViewHandlerRotate];
[self.view addSubview:stickerView];
}
UPDATE
Alright I downloaded the app and checked out blend. I think what the app is doing is just getting the opacity value of the foreground image with the slide bar and drawing the foreground image (opacity set) on the background image.
So to set the opacity of a UIImage check this out: How to set the opacity/alpha of a UIImage?
And to draw and image over another check this out: Draw another image on a UIImage
To summarize, what you need to do is:
1) get the position and size of the CHTStickerView after user rotated and resize
2) get the UIImage from CHTStickerView, get the opacity value from slider
3) set opacity to image and draw image on your background image
Hope this helps!
I have a UIButton backgroundImage that I use to display a weather condition image when the loading is complete. I also create a UIImageView that replaces the UIButton to animate a series of images as a progress indicator.
My question: How can fix this animated UIImageView x-axis misalignment across multiple screen sizes?
Here's what the sequence looks like on 4.7" iPhone, the red box indicates the image I'm talking about:
First, the UIImageView animating as a progress indicator (imagine it spinning, alignment is correct)
Second, the download complete, the progress indicator replaced by a UIButton with a backgroundImage:
Third, the UIImageView animating on 4" iPhone (note misalignment on x-axis):
Fourth, the download complete, UIButton replaces it, aligned correctly:
Here's how the UIImageView *progressIndicator is configured.
Note that conditionButton is the UIButton with backgroundImage of the weather condition:
self.progressIndicator = [[UIImageView alloc] initWithFrame:self.conditionButton.frame];
self.progressIndicator.contentMode = UIViewContentModeCenter;
self.progressIndicator.animationImages = #[...long series of images...];
self.progressIndicator.animationDuration = 0.5f;
[self.conditionButton setBackgroundImage:[UIImage imageNamed:#"empty.png"] forState:UIControlStateNormal];
[self.progressIndicator startAnimating];
[self.view addSubview:self.progressIndicator];
I'm pretty sure the issue is with
self.progressIndicator = [[UIImageView alloc] initWithFrame:self.conditionButton.frame];
But I'm not sure how to resolve this.
The same problem occurs when I switch to 5.5" iPhone. I have no Auto Layout warnings, and the constraints that apply to the conditionButton are:
Align Center X to superview
Width = 94
Height = 94
Bottom and Top space to nearest neighbor = default
Any help would be greatly appreciated!
Basic issue:
I believe the trick is with masking, but I am not able to get a good hold of how this is set.
Basically I have a bright image (set to a uiimageview object), and I have a label at very bottom (which is added on top of the image view) needs a well readable white text on it. Right now, the white text is hard to read (because of the bright background).
What I am doing:
I am setting a mask for the image view with something like
http://cl.ly/image/0i0N1p271d42
maskContainer = [CALayer layer];
UIImage *maskImg = [UIImage imageNamed:#"mask_profile"];
[maskContainer setContents:(id)[maskImg CGImage]];
CGRect frma = maskContainer.frame;
frma.size.width = self.frame.size.width;
frma.size.height = self.frame.size.height;
maskContainer.frame = frma;
[self.imageView.layer setMask:maskContainer];
Its messed up. The overall image starts fading on top.
Can anyone share their insight on the right way to mask?
You could set a drop shadow on your text to make is stand out even over a white background:
myLabel.layer.shadowOpacity = 0.8f;
myLabel.layer.shadowOffset = CGSizeMake(0, 0);
Easiest option is to adjust the alpha on the UILabel to the desired darkness in order to make the text stand out. If you do not want to hide the image and the image itself serves as a dark background, then set the alpha on the label to 0.
The best way to do this is to place the label in a uiview then create a gradient to apply as the background to the uiview. You can create the gradient as either an image with transparency or you can draw it in code. This will create a darkening effect on you bright image just behind the label so the text will pop.
I want to show an image of glass getting filled with water in iPhone using iOS 8. I can get a white background image of glass (that shows empty glass) and water color could be light grey, for example.
Is there an option to fill background color of glass (in intervals)
so that it looks as if the glass is really getting filled with water?
Can I draw complete image (glass already filled with water) part by
part from bottom to top to show similar effect?
Any options to display/animate such an image?
With UIImageView you can do like that, create an images for each frame:
images = #[[UIImage imageNamed:#"img1.png"],
[UIImage imageNamed:#"img2.png"],
[UIImage imageNamed:#"img3.png"]];
[imageView setAnimationImages:testArray] ;
imageView.animationDuration = 0.5;
imageView.animationRepeatCount = 1;
[imageView startAnimating];
Another way is to have UIView's/UIImageView's composition, e.g. UIImageView in front, use it as mask, another one in a back, and just use simple UIView animation.
But anyway, such a animation can be done in many ways, depends on your needs and how nice this animation should be.
UIButton top border appears thicker than the following ,but sometimes correct ，why?
code:
UIImage * sanImage = [UIimage imageNamed:#"product_bt1_normal"];
[self.saveBtn setBackgroundImage:[sanImage
stretchableImageWithLeftCapWidth:sanImage.size.width/3
topCapHeight:sanImage.size.height/3] forState:UIControlStateNormal];
Are you trying to make a button? If so, perhaps use a UIButton instead? You can control the border with button.layer.borderWidth = 1.0f
If you're set on using an image, create a UIImageView, and modify the border thickness that way:
UIImageView *iv = [[UIImageView alloc] initWithImage:sanImage];
[iv.layer setBorderWidth:0.5f];
It could be because of off-pixel boundaries. Since you are using height/3.0f, your image is maybe not returning a well-behaved image.
Also, there is a new stretchable image method you should be using, resizableImageWithCapInsets:.
So try this code out:
[self.saveBtn setBackgroundImage:[sanImage resizableImageWithCapInsets:UIEdgeInsetsMake(3.0f, 3.0f, 3.0f, 3.0f)] forState:UIControlStateNormal];
You might need to mess with the values for the insets a bit, I don't know the dimensions of your button image.