I have a ViewController that has a UIImageView as a background. What is the proper way to add a label on top of the image if I have the coordinates? My program is adding additional images on top of the UIImageView with:
UIGraphicsBeginImageContext(self.myBackground.image.size);
[newImage drawAtPoint: point];
// Draw a textlabel below the new image
// Some additional code
I have managed to draw the new Image on top of the original, but I don't know how to add the label.
Hank
[#"YOUR TEXT" drawAtPoint:point withFont:[UIFont boldSystemFontOfSize:15.0]];
You can use addSubview: method for UIImageView to add label or any other subview.
Set up label frame to be relative to uiimageview and add it as a subview:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
// To use point you can specify label size and after that you can set center:
label.center = point;
//set up other label properties
[self.myBackground addSubview:label];
//I assume self.myBackground is type of UIImageView
Related
I have a UITextfield like so:
UITextfield *name = [[UITextField alloc] initWithFrame:CGRectMake(30, 210, 100, 34)];
name.borderStyle = UITextBorderStyleRoundedRect;
name.backgroundColor = [UIColor whiteColor];
name.font = [UIFont systemFontOfSize:12];
name.leftView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"icon.png"]];
If I have the following UITextfield setup, how many points is the UIImage suppossed to be? Is it 34 by 34 or a little smaller? I know, if it's 34 points by 34 points I will have to make .pngs 34x34, 68x68 and 92x92 for x, 2x, and 3x pixel displays.
From the documentation:
The left overlay view is placed in the rectangle returned by the
leftViewRectForBounds: method of the receiver. The image associated
with this property should fit the given rectangle. If it does not fit,
it is scaled to fit. If you specify a control for your view, the
control tracks and sends actions as usual.
It means that you can change size of leftView.
On iOS 8.3 "leftViewRectForBounds:" value is based on the size of the leftView. If I use the leftView with size: 300x300 then the frame will be (0, -125, 300, 300). If I use the view with size 30x30, then the frame will be (0, 10, 30, 30).
A frame of my textField is (0.0, 0.0, 300.0, 50.0).
[[UIImageView alloc] initWithImage:[UIImage imageNamed:#"icon.png"]];
It's frame will be x=0, y=0, width = width of the image, height = height of the image
You can set any image of any resolution according to your requirement. Please also add the following line before the last line of your code for the image to be visible.
[name setLeftViewMode:UITextFieldViewModeAlways];
I have a UILabel. I need to rotate it programmatically.
I have my horizontal UILabel, for example with frame: x:0, y:0, w: 200, h:80.
Now I would like to rotate the label to make it vertical:
I try this code:
[self setTransform:CGAffineTransformMakeRotation(M_PI_2 / 2)];
I can see the contained text rotated. But I would like to rotate the whole frame: With my code, the UILabel continues to have the same frame.
Try this working code:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 200, 80)];
//set background color to see if the frame is rotated
[label setBackgroundColor:[UIColor redColor]];
[label setText:#"Text Here"];
label.transform=CGAffineTransformMakeRotation( ( 90 * M_PI ) / 180 );
[self.view addSubview:label];
Hope it helps
If you prefer set the label position and size visually in you xib or storyboard do the following:
Set the labels position and size in the interface builder like you want them to stay after the rotation.
Rotate the label and set the frame again:
-(void)rotateLabel:(UILabel*) label
{
CGRect orig = label.frame;
label.transform=CGAffineTransformMakeRotation(M_PI * 3/2);//270º
label.frame = orig;
}
Your Label is a square(w:100,h:100).So your label has transformed, but you can't see the change，because the width is equal to the height.
I am trying to create UIView with image and number. I want to center them. For now I have this code:
CGRect likesRect = CGRectMake(0,152, screenWidth / 2, 30);
MARoundedRect *likesRoundedRect = [[MARoundedRect alloc] initWithFrame:likesRect];
UIView *likesView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 30)];
likesView.center = CGPointMake(screenWidth / 4, 20);
UIImageView *likeImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 20, 20)];
likeImage.image = [UIImage imageNamed:#"favorite.png"];
UILabel *likesLabel = [[UILabel alloc]initWithFrame:CGRectMake(30, 0, screenWidth / 2, 20)];
[likesLabel setTextColor:[UIColor whiteColor]];
[likesLabel setBackgroundColor: [UIColor clearColor]];
[likesLabel setText:[actualPlace.Favorites stringValue]];
[likesView addSubview:likeImage];
[likesView addSubview:likesLabel];
[likesRoundedRect addSubview:likesView];
[viewController.view addSubview:likesRoundedRect];
For now it's working good but I am setting width of likesView to exact value and I guess this goes bad when I don't have number with one or two letters but more. How can I fix this? How to center content of UIView if there are two or more components with side by side? Or how can I set UIView to dynamically change width by content? Thanks
I am not writing full code but you try with following code,
CGRect likesRect = CGRectMake(0,152, screenWidth / 2, 30);
MARoundedRect *likesRoundedRect = [[MARoundedRect alloc] initWithFrame:likesRect];
CGSize likeViewSize = CGSizeMake(50,30);
UIView *likesView = [[UIView alloc] init];
likesView.frame = CGRectMake(likesRoundedRect.frame.size.width/2 - likeViewSize.width/2,likesRoundedRect.frame.size.height/2 - likeViewSize.height/2,likeViewSize.width,likeViewSize.height);
I have centered the likesView on its parentview. you have to do same thing for label and imageview if you want to center them on their parentview (likesView)
UIView and its subclasses has a property called center :
CGPoint center1 = CGPointmake(self.view.bounds.size.width/2,
self.view.bounds.size,height/2) ;
subview.center = center1;
The following discussion is from the Apple documentation on UIView:
#property(nonatomic) CGPoint center
Discussion
The center is specified within the coordinate system of its superview and is measured in points. Setting this property changes the values of the frame properties accordingly.
Changing the frame rectangle automatically redisplays the receiver without invoking the drawRect: method. If you want the drawRect: method invoked when the frame rectangle changes, set the contentMode property to UIViewContentModeRedraw.
Changes to this property can be animated. Use the beginAnimations:context: class method to begin and the commitAnimations class method to end an animation block.
Availability
Available in iOS 2.0 and later.
See Also
#property frame
#property bounds
#property transform
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Declared In
UIView.h
I have a view that is set up nicely using autolayout. The view contains a series of labels stacked from top to bottom. I am allowing the intrinsic size of these labels to determine the size of the view.
The final step is to add a background from an image. I started by trying the colorWithPatternImage method on UIColor but this isn't quite what I am looking for. I do not want to tile the image, and I can not guarantee it will always be larger than the intrinsic size of the view.
Similarly, adding a uiImageView to the view itself doesn't quite work. The view will expand to accommodate the image when I want to keep the intrinsic size based on the labels.
I guess what I am looking for is the following.
1) The background should have no effect on the size of the view.
2) The image should be scaled to fill the view but in it's original aspect ration (so cropping edges if necessary).
Any ideas appreciated.
In my case, I needed it for a UIImageView inside a dynamically-sized view in a UITableViewCell, but the image refused to shrink below its instristic size and instead worked as a minimum-size constraint for the superview. The only way I could get it ignore the intristic size is by lowering the priority at which it is enforced, right after creating the cell:
[imageView setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
forAxis:UILayoutConstraintAxisHorizontal];
[imageView setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
forAxis:UILayoutConstraintAxisVertical];
After this, all my constraints magically started working. In the OP's case, setting UIViewContentModeScaleAspectFill is also required, as per Mundi's answer.
In Interface Builder, add a UIImageView as the first subview to the view. Make sure its size always matches the view.
Then, in Interface Builder or code, set the contentMode:
backgroundImageView.contentMode = UIViewContentModeScaleAspectFill;
Here's how I would approach this. Hopefully it helps. :)
CGRect contentFrame = CGRectMake(0, 0, self.view.frame.size.width, 0); // This will be the frame used to create the background image view.
UIEdgeInsets contentInsets = UIEdgeInsetsMake(20, 20, 20, 20); // The margins by which the labels will be inset from the edge of their parent view.
CGFloat labelHeight = 21;
CGFloat verticalGap = 8; // The vertical space between labels
CGFloat y = contentInsets.top;
int numberOfLabels = 10;
for (int i = 0; i < numberOfLabels; i++) {
CGRect frame = CGRectMake(contentInsets.left, y, self.view.frame.size.width - (contentInsets.left + contentInsets.right), labelHeight);
UILabel *label = [[[UILabel alloc] initWithFrame: frame] autorelease];
// customize the label here
[self.view addSubview: label];
contentFrame = CGRectUnion(contentFrame, label.frame);
y += labelHeight + verticalGap;
}
contentFrame.size.height += contentInsets.bottom;
UIImageView *backgroundImageView = [[[UIImageView alloc] initWithFrame: contentFrame] autorelease];
[backgroundImageView setClipsToBounds: YES];
[backgroundImageView setContentMode: UIViewContentModeScaleAspectFill];
[backgroundImageView setImage: [UIImage imageNamed: #"background_image.png"]];
[self.view insertSubview: backgroundImageView atIndex: 0];
I have the following code to create a scroll view with additional area at the beginning and the end of the images (50 points).
UIScrollView* scroll = [[UIScrollView alloc] initWithFrame: CGRectMake(0,0,200,100)];
scroll.contentSize = CGSizeMake(400,100);
UIImageView* img1 = [[UIImageView alloc] initWithFrame: CGRectMake(50,0,100,100);
UIImageView* img2 = [[UIImageView alloc] initWithFrame: CGRectMake(150,0,100,100);
UIImageView* img3 = [[UIImageView alloc] initWithFrame: CGRectMake(250,0,100,100);
//Adding images to ImageViews
scroll.pagingEnabled = YES;
[scroll addSubView:img1];
[scroll addSubView:img2];
[scroll addSubView:img3];
The first time I see the view, I will see the additional area on the left (0-50), then the first image (50-150) and then half of the second image (150-200).
When I swipe left, I want to see half of the first image on the right, the second image at the center, and half of the third image on the right.
When I swipe left again, I want to see the third image at center, with half of the second image on the left, and the additional area on the right.
Can it be possible?
It's possible as long as you define everything correctly. Make sure that the assigned content size is equal to the overall size that you wish to scroll through. Make sure that each page size is equal to the scroll view's frame. You can set the clipsToBounds to NO if the frame clips your subviews.
You can do this by adjusting the contentSize of UIScrollView
- (void)addImagesToScrollView{
//An offset from where imageViewStarts
CGFloat xOffset = 50.0f;
CGRect imageViewFrame = CGRectMake(xOffset, 0.0f, 100.0f, 100.0f);
for (NSString *imageName in #[#"image1.jpg",#"image2.jpg",#"image3.jpg"])
{
UIImageView *imageView = [[UIImageView alloc]initWithFrame:imageViewFrame];
UIImage *image = [UIImage imageNamed:imageName];
imageView.image = image;
[self.scrollView addSubview:imageView];
imageViewFrame.origin.x+=imageViewFrame.size.width;
}
CGSize contentSize = self.scrollView.frame.size;
//Content size is calculate from the imageViewFrame and an offset is added to it
contentSize.width = imageViewFrame.origin.x+xOffset;
[self.scrollView setContentSize:contentSize];
}
Source Code
You can scroll to a particular place in the scrollview using the following code
[YOURSCROLLVIEW setContentOffset:CGPointMake(x, y) animated:YES];