Hi i'm trying to add a top and bottom margin to all my PackageCells.
like
what ive tried
%hook PackageCell
-(void)didMoveToWindow {
self.layer.cornerRadius = 15.0f;
self.layer.masksToBounds = true;
%orig;
}
-(CGRect)frame {
CGRect r = %orig;
return CGRectMake(40, 0, r.size.width, r.origin.height+20);
}
-(void)setFrame:(CGRect)frame {
CGRect r = frame;
%orig(CGRectMake(40, 0, r.size.width, r.origin.height+20));
}
%end
All cells get stacked on top of eachother and look weird.
You should set the backgroundColor of the cell to [UIColor clear]
And Change the frames of the contentView instead and make that view round
self.contentView.layer.cornerRadius = 15.0f;
And update the frame for this
self.contentView.frame = CGRectMake(40, 0, self.frame.size.width, self.frame.origin.height+20);
Related
I wrote an example about Wave Animation.The animation is ok,but I don't understand why the custom UIView needs to add "self.layer.masksToBounds = YES" to have the round Corner.
This is a custom UIView. I have rewritten its drawRect. If i don't set "masksToBounds" to YES, the round corner disappear.
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.frame = CGRectMake(10, 40, 300, 300);
self.layer.cornerRadius = 150;
self.backgroundColor = [UIColor greenColor];
self.layer.borderColor = [UIColor blueColor].CGColor;
self.layer.borderWidth = 2;
// self.layer.masksToBounds = YES; //if write this line,the round corner appear
self.x_move = 0;
self.y_move = 300;
}
return self;
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGMutablePathRef path = CGPathCreateMutable();
CGContextSetLineWidth(context, 1);
CGContextSetFillColorWithColor(context, [UIColor grayColor].CGColor);
CGPathMoveToPoint(path, NULL, 0, 0);
for(float i=0; i<=300; i++){
float x=i;
float y = 5 * sin( 0.05 * x+ self.x_move) + self.y_move;
CGPathAddLineToPoint(path, nil, x, y);
}
CGPathAddLineToPoint(path, nil, 300, 0);
CGPathAddLineToPoint(path, nil, 0, 0);
CGContextAddPath(context, path);
CGContextFillPath(context);
CGContextDrawPath(context, kCGPathStroke);
CGPathRelease(path);
}
- (void)startAnimation {
if (self.waveTimer == nil) {
self.waveTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(refresh) userInfo:nil repeats:YES];
}
}
- (void)refresh {
self.x_move += 0.3;
self.y_move -= 0.2;
if(self.y_move - 100 < 0.00001){
[self.waveTimer invalidate];
}else{
[self setNeedsDisplay];
}
}
ViewController:
self.wave = [[waveAnimation alloc] init];
[self.wave startAnimation];
[self.view addSubview:self.wave];
This is a normal UIView. Its "masksToBunds" is NO, but its round corner shows normal. Compared with the examples above, why one should add, one does not need.
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20, 60, 100, 100)];
view.backgroundColor = [UIColor greenColor];
view.layer.cornerRadius = 50;
view.layer.borderWidth = 2;
view.layer.borderColor = [UIColor blackColor].CGColor;
[self.view addSubview:view];
The reason for this is from your override of drawRect:(CGRect)frame.
You are attempting to set the corner radius of the layer that is not the element you assigned the fill color to. The reason setting masksToBounds achieves the desired rounded corner is because here you are telling the view to mask all of it's layers to the bounds from your frame.
In your second example with the UIView the corner radius appears as expected because you have not adjusted it's layers.
I suggest either adopting setting masksToBounds or redraw the view's bounds a different way if you need masksToBounds = NO. Since you have the "squiggle" sin curve and you want rounded corners, perhaps just create a generic rounded rect (one with the desired corner radius) then merge that with the path you have already created with the sin wave.
Merge multiple CGPaths together to make one path
That link may help you merge your rounded view with your custom view to achieve the desired end result.
Otherwise.. probably best bet to just set this to yes.
As we know, the table view separator is so thin and beautiful. Sometimes we have to build some separator line in storyboard or nib, the min number is 1, but actually the line appears much thicker than we expected.
My question is how to draw a 1px line in storyboard?
Xcode 9 Swift: You can add a thin seperator with 1px line in the Storyboard using UIView.
Under Size Inspector, Just set the height to 1, width example to 360.
Apple documentation on UIView.
I got your point too, finally I find way out.
As we know, if we draw a line and set the height by code, we can set the height equal to (1.0 / [UIScreen mainScreen].scale).
But here, you wanna to draw in storyboard.
My way is subclass UIView or UIImageView, based on your demand as OnePXLine. In OnePXLine class, override layoutSubviews like below:
- (void)layoutSubviews {
[super layoutSubviews];
CGRect rect = self.frame;
rect.size.height = (1 / [UIScreen mainScreen].scale);
self.frame = rect;
}
And you can draw 1 px line in storyboard by use this class.
Goodluck!
This would help you if you're coding in Swift:
func lineDraw(viewLi:UIView)
{
let border = CALayer()
let width = CGFloat(1.0)
border.borderColor = UIColor(red: 197/255, green: 197/255, blue: 197/255, alpha: 1.0).CGColor
border.frame = CGRect(x: 0, y: viewLi.frame.size.height - width, width: viewLi.frame.size.width, height: viewLi.frame.size.height)
border.borderWidth = width
viewLi.layer.addSublayer(border)
viewLi.layer.masksToBounds = true
}
You can do like in any UIControl/UIElement for this and change the height as 1
If you want to 1 Point use this - 1
If you want to 1pixel Use this - 1.0 / UIScreen.mainScreen().scale
Objective-C
UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, self.view.frame.size.width, 1)]; // customize the frame what u need
[lineView setBackgroundColor:[UIColor yellowColor]]; //customize the color
[self.view addSubview:lineView];
Swift
var lineView = UIView(frame: CGRect(x: 0, y: 50, width: self.view.frame.size.width, height: 1))
lineView.backgroundColor = UIColor.yellow
self.view.addSubview(lineView)
If you want a more information see this once
you can assign float value for view frame . so what you can do is take any view (lable,textview,view,textfield) and assign height as 0.4f or something programatically and width to match self width.
lable.frame = CGRectMake(0,0,width of self.view,0.4f);
Try it in cellForRowAtIndex
UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, 1)];
separatorLineView.backgroundColor = [UIColor colorWithRed:242/255.0f green:222/255.0f blue:52/255.0f alpha:1.0];
[cell.contentView addSubview:separatorLineView];
Swift 5 code base on what #childrenOurFuture answered:
class OnePXLine: UIView {
override func layoutSubviews() {
super.layoutSubviews()
var rect = self.frame;
rect.size.height = (1 / UIScreen.main.scale);
self.frame = rect;
}
}
I have a UIView above my UITableView. When the user scrolls down I want the UIView to stay in place at the top of the screen and have the cells scroll over it. The first page of the Shazam app does what I want.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (self.tableView.contentOffset.y > 0) {
CGRect newframe = self.publicTopView.frame;
newframe.origin.y = -self.tableView.contentOffset.y;
self.publicTopView.frame = newframe;
}
}
This is what I've tried so far, but it doesn't do anything. Thanks
I would set the tableView.backgroundView to your view, and then set your cells to be clear (or whatever transparency you like). This will allow the cells to move over the view.
You need to have a scrollView with a transparent background. Then add a subview to it that is not transparent and offset down a bit. Here's an overkill example. The TextureView is just so you can see that the background isn't moving.
#import "ViewController.h"
#interface TextureView : UIView
#end
#implementation TextureView
-(void)drawRect:(CGRect)rect{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextBeginPath(context);
CGContextMoveToPoint(context, 0, 0);
CGContextAddLineToPoint(context, rect.size.width, rect.size.height);
CGContextMoveToPoint(context, 0, rect.size.height);
CGContextAddLineToPoint(context, rect.size.width, 0);
CGContextSetStrokeColorWithColor(context, [[UIColor whiteColor]CGColor]);
CGContextSetLineWidth(context, 8);
CGContextStrokePath(context);
}
#end
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
CGRect scrollViewFrame = self.view.frame;
CGFloat sectionHeight = 300;
int numberSections = 3;
CGFloat clearSpaceAtTop = 300;
CGRect sectionsViewFrame = CGRectMake(0, clearSpaceAtTop, scrollViewFrame.size.width, sectionHeight * numberSections);
CGSize contentSize = CGSizeMake(scrollViewFrame.size.width, CGRectGetMaxY(sectionsViewFrame));
TextureView *backGroundView = [[TextureView alloc]initWithFrame:scrollViewFrame];
backGroundView.backgroundColor = [UIColor blueColor];
[self.view addSubview:backGroundView];
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:scrollViewFrame];
scrollView.contentSize = contentSize;
scrollView.backgroundColor = [UIColor clearColor];
[self.view addSubview:scrollView];
UIView *sectionViewsParent = [[UIView alloc]initWithFrame:sectionsViewFrame];
sectionViewsParent.backgroundColor = [UIColor lightGrayColor];
[scrollView addSubview:sectionViewsParent];
NSArray *colors = #[[UIColor redColor],[UIColor greenColor],[UIColor purpleColor]];
CGFloat spacer = 4;
CGRect colorViewFrame = CGRectMake(0, 0, sectionsViewFrame.size.width, sectionHeight - spacer);
for (UIColor *color in colors){
UIView *sectionView = [[UIView alloc]initWithFrame:colorViewFrame];
sectionView.backgroundColor = color;
[sectionViewsParent addSubview:sectionView];
colorViewFrame.origin.y += sectionHeight;
}
}
#end
If the UIView instance is called iconView, the UITableView instance is called tableView,
If your view controller is UIViewController.
[self.view addSubview:iconView];
[self.view addSubview:tableView];
//and you need set tableView.background to transparent.
If your view controller is UITableViewController, read this question:
UITableViewController Background Image
basically all you have to do is to use UIScrollView's contentInset property
let topInset = topViewHeight.constant //based on your needs
sampleTableView.contentInset = UIEdgeInsets(top: topInset, left: 0, bottom: 0, right: 0)
see my github sample here
I am trying I make a UI label auto scroll the text that is inside it like a marquee. The below code works depending on what kind of text/content I throw at it. I can't tell what works and what does not. What happens is that the label does not show anything, then suddenly scrolls the text at an extremely high speed that you can't read it.
For some reason, this works perfectly on the iPhone but not on the iPad. I am guessing because the text I am putting at the iPhone is always way bigger than the Uilabel's size?
Here is the code:
self.currentTrack.textColor = [UIColor colorWithRed:15.0/255.0 green:176.0/255.0 blue:223.0/255.0 alpha:1];
self.currentTrack.labelSpacing = 35; // distance between start and end labels
self.currentTrack.pauseInterval = 1.7; // seconds of pause before scrolling starts again
self.currentTrack.scrollSpeed = 30; // pixels per second
self.currentTrack.textAlignment = NSTextAlignmentCenter; // centers text when no auto-scrolling is applied
self.currentTrack.fadeLength = 12.f;
self.currentTrack.scrollDirection = CBAutoScrollDirectionLeft;
[self.currentTrack observeApplicationNotifications];
}
Here is the code:
AutoScrollLabel, extended from UIView (code provided below) has an instance method to set text (setLabelText). The text provided will auto scroll only if the length of the text is bigger than the width of the AutoScrollLabel view.
Eg:
AutoScrollLabel *autoScrollLabel = [[AutoScrollLabel alloc] initWithFrame:CGRectMake(0, 0, 150, 25)];
[autoScrollLabel setLabelText:#"Some lengthy text to be scrolled"];
Note: You can make changes in setLabelText: Method implementation to support Attributed Text (use appropriate methods to find size of Attributed Text)
*** AutoScrollLabel.h
#interface AutoScrollLabel : UIView {
UILabel *textLabel;
NSTimer *timer;
}
- (void) setLabelText:(NSString*) text;
- (void) setLabelFont:(UIFont*)font;
- (void) setLabelTextColor:(UIColor*)color;
- (void) setLabelTextAlignment:(UITextAlignment)alignment;
#end
**** AutoScrollLabel.m
#import "AutoScrollLabel.h"
#import <QuartzCore/QuartzCore.h>
#implementation AutoScrollLabel
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.clipsToBounds = YES;
self.autoresizesSubviews = YES;
textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
textLabel.backgroundColor = [UIColor clearColor];
textLabel.textColor = [UIColor blackColor];
textLabel.textAlignment = UITextAlignmentRight;
[self addSubview:textLabel];
}
return self;
}
-(void) setLabelText:(NSString*) text {
textLabel.text = text;
CGSize textSize = [text sizeWithFont:textLabel.font];
if(textSize.width > self.frame.size.width) {
textLabel.frame = CGRectMake(0, 0, textSize.width, self.frame.size.height);
}
else {
textLabel.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
}
if(textLabel.frame.size.width > self.frame.size.width) {
[timer invalidate];
timer = nil;
CGRect frame = textLabel.frame;
frame.origin.x = self.frame.size.width-50;
textLabel.frame = frame;
timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(moveText) userInfo:nil repeats:YES];
}
else {
[timer invalidate];
timer = nil;
}
}
-(void) moveText {
if(textLabel.frame.origin.x < textLabel.frame.size.width-2*textLabel.frame.size.width) {
CGRect frame = textLabel.frame;
frame.origin.x = self.frame.size.width;
textLabel.frame = frame;
}
[UIView beginAnimations:nil context:nil];
CGRect frame = textLabel.frame;
frame.origin.x -= 5;
textLabel.frame = frame;
[UIView commitAnimations];
}
- (void) setLabelFont:(UIFont*)font {
textLabel.font = font;
}
- (void) setLabelTextColor:(UIColor*)color {
textLabel.textColor = color;
}
- (void) setLabelTextAlignment:(UITextAlignment)alignment {
textLabel.textAlignment = alignment;
}
For Swift5
set top of your UILabel equal to superview bottom, and then use this code:
func createAnimationLbl() -> CAAnimation {
let animation = CABasicAnimation(keyPath: "transform.translation.y")
animation.fromValue = 0
animation.toValue = -(self.view.frame.height )
animation.duration = 15
animation.repeatCount = Float.infinity //times of scrolling, infinity for unlimited times.
animation.timingFunction = CAMediaTimingFunction.init(name: CAMediaTimingFunctionName.linear)
animation.fillMode = CAMediaTimingFillMode.forwards
animation.isRemovedOnCompletion = false
return animation
}
then in your viewWillAppear call it as below:
self.aboutLbl.layer.add(createAnimationLbl(), forKey: nil)
In one of my views I have a bottom bar. A tap on this view animates a temporary cart half way to the screen. Now, where there is no item in the temporary table I show a no data overlay which is nothing but a view with an empty cart image and text underneath it.
The issue is: when this table animates to expand and collapse, the no data overlay does not look good during animation. It appears that the image is also shrinking/expanding until the temporary table view stops animating.
So, I tried by playing with the alpha of the temporary table view while this animation happens so that it does not look that bad. But this is not helping either. There is an abrupt flash in the end.
Any suggestions?
self.temporaryTable.backgroundView = self.noDataOverlay;
[UIView animateWithDuration:0.5 animations:^{
self.temporaryTable.alpha = 0.5;
} completion:^(BOOL finished) {
self.temporaryTable.alpha = 1.0;
}];
Here is my code for drawing the image:
- (void)drawRect:(CGRect)iRect scalingImage:(BOOL)iShouldScale {
CGRect aRect = self.superview.bounds;
// Draw our image
CGRect anImageRect = iRect;
if (self.image) {
//scale the image based on the height
anImageRect = CGRectZero;
anImageRect.size.height = self.image.size.height;
anImageRect.size.width = self.image.size.width;
#ifdef ACINTERNAL
if (iShouldScale) {
anImageRect = [self aspectFittedRect:anImageRect max:aRect];
} else {
anImageRect.origin.x = (iRect.size.width/2) - (anImageRect.size.width/2);
anImageRect.origin.y = kTopMargin;
}
#else
anImageRect.origin.x = (iRect.size.width/2) - (anImageRect.size.width/2);
anImageRect.origin.y = kTopMargin;
#endif
if (self.shouldCenterImage)
anImageRect.origin.y = (iRect.size.height/2) - (anImageRect.size.height/2);
[self.image drawInRect:anImageRect];
} else {
anImageRect.origin.y = (iRect.size.height/6);
anImageRect.size.height = (iRect.size.height/6);
}
// Draw our title and message
if (self.title) {
CGFloat aTop = anImageRect.origin.y + anImageRect.size.height + kSpacer;
CGFloat aWidth = aRect.size.width;
UIColor *aColor = [UIColor colorWithRed:96/256.0 green:106/256.0 blue:122/256.0 alpha:1];
[aColor set];
CGRect aTextRect = CGRectMake(0, aTop, aWidth, kTitleHeight * 2);
UIFont *aTitleFont = [UIFont boldSystemFontOfSize:kTitleFontSize];
[self.title drawInRect:aTextRect withFont:aTitleFont lineBreakMode:NSLineBreakByClipping alignment:NSTextAlignmentCenter];
if (self.subTitle) {
UIFont *aSubTitleFont = [UIFont systemFontOfSize:kSubTitleFontSize];
aTextRect = CGRectMake(0, aTop+kSpacer, aWidth, kTitleHeight);
[self.subTitle drawInRect:aTextRect withFont:aSubTitleFont lineBreakMode:NSLineBreakByClipping alignment:NSTextAlignmentCenter];
}
}
}
- (void)addToView:(UIView *)iView {
// setting a unique tag number here so that if the user has any other tag there should not be a conflict
UIView *aView = [iView viewWithTag:699];
if (aView) {
[aView removeFromSuperview];
}
self.tag = 699;
[iView addSubview:self];
}
- (void)removeView {
[super removeFromSuperview];
}
-(void)setViewFrame:(CGRect) iFrame {
CGRect aRect = self.frame;
aRect.size.width = iFrame.size.width;
aRect.size.height = iFrame.size.height;
self.frame = aRect;
[self setNeedsDisplay];
}
- (CGRect)aspectFittedRect:(CGRect)iRect max:(CGRect)iMaxRect {
float anOriginalAspectRatio = iRect.size.width / iRect.size.height;
float aMaxAspectRatio = iMaxRect.size.width / iMaxRect.size.height;
CGRect aNewRect = iMaxRect;
if (anOriginalAspectRatio > aMaxAspectRatio) { // scale by width
aNewRect.size.height = iMaxRect.size.width * iRect.size.height / iRect.size.width;
} else {
aNewRect.size.width = iMaxRect.size.height * iRect.size.width / iRect.size.height;
}
aNewRect.origin.y = (iMaxRect.size.height - aNewRect.size.height)/2.0;
aNewRect.origin.x = (iMaxRect.size.width - aNewRect.size.width)/2.0;
return CGRectIntegral(aNewRect);
}
One possibility here is to fix the original problem, namely the fact that the empty cart image is expanding/collapsing as the view animates. Without seeing your code it is difficult to solve this problem, but in my own code what I do is set the contentMode of the UIImageView to UIViewContentModeBottom. This causes the image to stay the same size even though the image view that contains it may grow and shrink as part of the animation.
You see a flash because you animate alpha up to 0.5 and then when animation completes you set it from 0.5 to 1.0. Just animate the alpha up to 1.0:
[UIView animateWithDuration:0.5
animations:^
{
self.temporaryTable.alpha = 1.0;
}];