I have 3 images, on switch background, off switch background and image for the round button in the switch. I need to implement a switch in ios6 with this design, so I need to change the width for this element and to change this three images. I try do make it this way:
self.optionSwitch.onImage = [UIImage imageNamed:#"switch_image_on"];
self.optionSwitch.offImage = [UIImage imageNamed:#"switch_image_off"];
CGRect switchRect = self.optionSwitch.frame;
switchRect.size.width = 40.0f;
self.optionSwitch.frame = switchRect;
but this code changed only the background for on and off state, I can't change the width of the whole element and the button style. How can I solve this? Thanks.
[self.optionSwitch setTransform:CGAffineTransformMakeScale(1.50, 1.75)];
50% increase in width, 75% increase in length.
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In an app I've built, I had a table view showing an image to the left of each cell by running the following code inside of cellForRowAtIndexPath:
cell.imageView.image = [UIImage imageNamed:myImage];
But the image was too big, so I shrunk it:
cell.imageView.transform = CGAffineTransformMakeScale(0.3, 0.3);
This worked just fine in iOS 10. But once I upgraded to the newest Xcode with the iOS 11 SDK, the images got enormous. It turns out that that second line of code transforming the image view is now doing nothing: I can comment it out, change the 0.3's to something else, etc., and it doesn't make any difference. CGAffineTransformMakeScale still has documentation in the new Xcode, so I'm assuming it wasn't deprecated, but then why did this break with iOS 11, and how do I fix it? Any ideas? Thanks in advance! Please note, I'm using Objective-C.
Edit:
Just tried 3 changes to the code:
Change the second line to cell.imageView.transform = CGAffineTransformMakeScale(0.0000001, 0.0000001);. Nothing happens (i.e., the image views and the images inside them are still just as huge).
Change the second line to cell.imageView.transform = CGAffineTransformMakeScale(0, 0);. The image disappears from the image view, but the image view is still the same size, and you can tell because it still displaces the text in the cell and pushes it far to the right.
Remove the first line of code (no longer assigning an image to the imageview). The imageview disappears, and the text moves all the way to the left of the cell.
Perhaps this can help shed some light on what's going on?
So if you are trying to adjust the image size to fit the imageView you should actually use the imageView's contentMode property like so:
cell.imageView.contentMode = UIViewContentModeScaleAspectFit;
or in Swift for others
cell.imageView.contentMode = .scaleAspectFit
This keeps the dimensions of the image and fits the maximum size image onto the imageView without changing the dimensions
You could also try UIViewContentModeScaleAspectFit (or .scaleAspectFill in Swift) which basically fills the dimensions of the imageView entirely, but if the picture is wider or taller than the image view it crops what can't fit.
Here are all the contentModes directly from a Obj-C and Swift source files:
typedef NS_ENUM(NSInteger, UIViewContentMode) {
UIViewContentModeScaleToFill,
UIViewContentModeScaleAspectFit, // contents scaled to fit with fixed aspect. remainder is transparent
UIViewContentModeScaleAspectFill, // contents scaled to fill with fixed aspect. some portion of content may be clipped.
UIViewContentModeRedraw, // redraw on bounds change (calls -setNeedsDisplay)
UIViewContentModeCenter, // contents remain same size. positioned adjusted.
UIViewContentModeTop,
UIViewContentModeBottom,
UIViewContentModeLeft,
UIViewContentModeRight,
UIViewContentModeTopLeft,
UIViewContentModeTopRight,
UIViewContentModeBottomLeft,
UIViewContentModeBottomRight,
};
public enum UIViewContentMode : Int {
case scaleToFill
case scaleAspectFit // contents scaled to fit with fixed aspect. remainder is transparent
case scaleAspectFill // contents scaled to fill with fixed aspect. some portion of content may be clipped.
case redraw // redraw on bounds change (calls -setNeedsDisplay)
case center // contents remain same size. positioned adjusted.
case top
case bottom
case left
case right
case topLeft
case topRight
case bottomLeft
case bottomRight
}
EDIT:
Since I see you're also interested in changing the dimensions of the imageView itself ("to leave more room for the text") what I would suggest is actually, either in storyboard or programmatically use AutoLayout to add your own imageView and have it sized and placed how you want it, instead of using the default imageView on a cell which is meant as a convenient/standardized tool.
If you are unfamiliar this I would google for an AutoLayout tutorial. Or maybe "using AutoLayout to create custom UITableViewCell"
If you dont actually want to create your own subclass you can try setting the `cell.imageView.frame = ..." somewhere to manually resize it to what you want, then setting its content mode to make sure the image fits nicely still.
See this question: How do I make UITableViewCell's ImageView a fixed size even when the image is smaller
Found an answer to my own question, with credit due to Paul's answer from this question: How to resize a cell.imageView in a TableView and apply tintColor in Swift
CGSize itemSize = CGSizeMake(50, 50);
UIGraphicsBeginImageContextWithOptions(itemSize, false, 0);
CGRect imageRect = CGRectMake(0, 0, itemSize.width, itemSize.height);
[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
I still don't know why the old CGAffineTransformMakeScale doesn't work anymore, but this gets the job done.
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.
If I have a UIButton and give it a red background, and the background size is a little too small or too big for my liking (but the tap target size is perfect), is there any way to change the size of them?
Basically the equivalent of adding padding in CSS so that it either takes up more area or less? Purely an aesthetic change.
Say with the background color applied to the button it visually takes up a 100px * 30px area. I want it to be 90px * 25px. Is this possible?
One way to do this, is to set the color of a sublayer of the button rather than the background color of the button itself.
- (void)viewDidLoad {
[super viewDidLoad];
CALayer *sub = [CALayer new];
sub.frame = CGRectInset(self.topButton.bounds, 5, 2.5); // this will make the layer 90x25 for a button that is 100x30
sub.backgroundColor = [UIColor redColor].CGColor;
[self.topButton.layer addSublayer:sub];
}