I need to set a background color or background image in my iOS application's launch screen. I was wondering if there was a code similar to:
self.view.backgroundcolor=[UIColor redColor];
Thank you
If you want to set background image for launch screen than there is two way:
Use image.axassets and add new LaunchImage set in it.
You can add UIImageView in LaunchScreen.xib and set image to it.
If you want to set background colour for launch image than add UIView in LaunchScreen.xib and set backgroundColor propertity of it.
Both way is easy but I preferred to go with image.axassets LunchImage set.
Note: If you use image.axassets LaunchImage than do not forget to migrate this set with application.
Related
I'm making my first app in Swift and I noticed that when I create UIButtons in the storyboard when selected (highlighted) in the app they only change background if the button is an image.
I was wondering if there is any way in Swift to change that so that even the buttons with no image will change their background to a darker background.
Thanks for the help.
UIButton's default behaviour is to change its background on click.
try dragging a new UIButton on Interface Builder, and run the program without doing any changes to the button.
With your specific button, inspect it in Interface Builder and check that its type is System, otherwise you don't get that default behaviour.
I can't seem to figure out how to programmatically set a new image, via the outlet, and make it start animating.
Sequence
zeroEntering0.png
zeroEntering1.png
zeroEntering2.png
zeroEntering3.png
zeroEntering4.png
I imported the sequence of images into the Image.xcassets inside the WatchKit App
I can set the image in the interface builder to "zeroEntering" and set animating to "Yes" and it works correctly.
However, I want something more dynamic, I need a button press to choose a new animation sequence and start it off. If I try and set the image programmatically using the same name from the interface builder, the UIImage is nil.
What naming convention should I use when programmatically setting the UIImage? "zeroEntering", "zeroEntering0", "zeroEntering.png" or "zeroEntering0.png"
I tried using the two non-nil options and the image did not animate and went black.
The answer is subtle and definitely got my wheels spinning for too long.
According to this beautiful article,
You should use setImageNamed(:) when the image you want to display is either cached on the watch on is in an asset catalog in the watch app’s bundle, and use setImage(:) when the image isn’t cached — this will transfer the image data to the Apple Watch over the air!
So, I kept my images in the assets catalog on the watch app, and switch to use,
[self.testImage setImageNamed:#"zeroEntering"];
[self.testImage startAnimatingWithImagesInRange:NSMakeRange(0, 4) duration:0.2 repeatCount:100];
Set the image as [UIImage imageNamed:#"entering"] then call startAnimatingWithImagesInRange:duration:repeatCount:
Check it out here: https://developer.apple.com/library/prerelease/ios/documentation/WatchKit/Reference/WKInterfaceImage_class/#//apple_ref/occ/instm/WKInterfaceImage/startAnimatingWithImagesInRange:duration:repeatCount:
Make sure to follow the tips here: https://developer.apple.com/watchkit/tips/
I have a requirement to make application that has color theme base on user selection
User selects an color at begining (in 8 available colors), that color will be applied for the whole app (background color, buttons, icons ....)
If I create images for each color, the app will have lots of images and can be heavy in size, and that approach not seem to be good one.
I tried to import images with 1 color and then change images color according to user-selected color, but got problem with some controls like slider, and also the image that is changed does not look good as photoshop one
Would u plz help me with good approach for this?
Make all the images one color (black probably), then let the user pick a color and save it to user defaults. Link all items that need to get the theme to the color from the user defaults. Then use the tintColor property of the UIImageView to themefy your app.
Method to tint any UIImageView:
- (void)tintImageView:(UIImageView *)imageView withTint:(UIColor *)tintColor
{
imageView.image = [imageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[imageView setTintColor:tintColor];
}
Example use to tint Button:
[self tintImageView:self.button.imageView withTint:[UIColor blueColor]];
Example use to tint UIImageView:
[self tintImageView:self.imageView withTint:[UIColor blueColor]];
If you're using iOS7 you can take advantage of the tintColor property.
For images you need to be sure they are created using template option.
Please checkout this clear tutorial that will guide you to apply themes to different kind of controls in your app: Theming iOS Applications
You could probably be interested in trying Pixate Freestyle too, which basically allow you to apply styles like css does to your iOS app, that a pretty cool tool and I've found it very easy to use too.
I am having problems with a png image, that gets wrong colors on iOS compared to the actual image.
It does not matter how I am using the image, it always gets the wrong colors. I have tried on UIButton and UIImageView and it gives the same result.
It is a very standard use of a UIImage:
UIImage* greenButtonImg = [UIImage imageNamed:#"btn_green"];
UIImageView* testView = [[UIImageView alloc] initWithImage:greenButtonImg];
[self.view addSubview:testView];
The second image is how it looks on iOS and the first button is how it looks on my Mac (Finder and Photoshop):
As you can see the second button has a different green color.
This is happening all over the app where am using this picture. It happens in the Simulator and on a iPhone 5.
What can cause this issue? Can this be caused by settings in Photoshop, where the image was created?
As Jeff wrote in a comment it was a problem with the RGB Profiles.
I managed to fix the problem by converting the color profile in Photoshop:
Edit -> Convert to Profile... -> Set profile to "Apple RGB"
In iOS 7.0, the image is colored with the toolbar’s tintColor.
In iOS 7.0, all subclasses of UIView derive their behavior for tintColor from the base class.
By default, an image (UIImage) is created with UIImageRenderingModeAutomatic.
If you have UIImageRenderingModeAutomatic set on your image, it will be treated as template or original based on its context.
Certain UIKit elements—including navigation bars, tab bars, toolbars, segmented controls—automatically treat their foreground images as templates, although their background images are treated as original.
Other elements—such as image views and web views—treat their images as originals. If you want your image to always be treated as a template regardless of context, set UIImageRenderingModeAlwaysTemplate.
If you want your image to always be treated as original, set UIImageRenderingModeAlwaysOriginal.
Refer Template Images for more info.
I'm created a Master Detail app on Xcode 4.x for iPad. I've tried adding a custom background image to the detail part of it which works fine the problem is the background image is appearing pixalated. The image is of size 2048 x 1546 (for the Retina screen on my iPad) and if I view it as a photo on the iPad it doesn't appear pixalated so why does it when it's being used as a background?
The code I'm using to set it is,
UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:#"leather.png"]];
self.view.backgroundColor = background;
The only thing I could think of is because a Master Detail app has the scroll bar at the side but how would I fix that? Or what is the real cause? It appears pixalated or any orientation.
Add an image with the filename "leather#2x.png", otherwise UIImage won't recognize that it's supposed to be a high-resolution image. Alternatively, you may want to use a regular UIImageView instead of a pattern color.