I have a TTStyledTextLabel inside a UITableViewCell. Clicking on the cell navigates to a new view controller, so I can't disable selection, but when I click the TTStyledTextLabel, the UITableViewCell is also selected. Any thoughts on clicking the TTStyledTextLabel without also selecting the table view cell?
Just subclass TTStyledTextLabel and override the following two methods:
(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
just like this:
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
UITouch* touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
point.x -= _contentInset.left;
point.y -= _contentInset.top;
TTStyledBoxFrame* frame = [_text hitTest:point];
if (frame) {
[self setHighlightedFrame:frame];
}
}
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
TTTableView* tableView = (TTTableView*)[self ancestorOrSelfWithClass:[TTTableView class]];
if (!tableView) {
if (_highlightedNode) {
// This is a dirty hack to decouple the UI from Style. TTOpenURL was originally within
// the node implementation. One potential fix would be to provide some protocol for these
// nodes to converse with.
if ([_highlightedNode isKindOfClass:[TTStyledLinkNode class]]) {
TTOpenURL([(TTStyledLinkNode*)_highlightedNode URL]);
} else if ([_highlightedNode isKindOfClass:[TTStyledButtonNode class]]) {
TTOpenURL([(TTStyledButtonNode*)_highlightedNode URL]);
} else {
[_highlightedNode performDefaultAction];
}
[self setHighlightedFrame:nil];
}
}
}
I have one Masterview.it has lot of childviews.I am using the following code to detect the touched view and to bring front the corresponding view.the code works fine.But When I add subview to childview,it did not work , any help please?
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
{
self.hitView = nil;
self.hitView = [super hitTest:point withEvent:event];
int x = self.hitView.frame.origin.x;
int y = self.hitView.frame.origin.y;
NSLog(#"x = %d",x);
NSLog(#"y = %d",y);
if ([self.viewDelegate respondsToSelector:
#selector(view:hitTest:withEvent:hitView:)])
{
return [self.viewDelegate view:self hitTest:point
withEvent:event hitView:hitView];
}
else
{
[self bringSubviewToFront:self.hitView];
return hitView;
}
}
If I get it right, it's pretty easy: hitTest always returns the farthest descendant subview in the view. If there is no subview this is always the same view. If there is one, that subview might be returned instead. Here's how you could fix it:
self.hitView = [super hitTest:point withEvent:event];
if ([self.hitView isDescendantOfView: self])
self.hitView = self;
EDIT Now that I understand the problem better, you should maybe do the following. This code returns the superview that's a direct descendant of the outer view:
UIView *hitView = [super hitTest:point withEvent:event];
while (hitView && hitView.superview != self)
hitView = hitView.superview;
(Please also note that you should use a local variable and change your property later than).
As you said you're moving UIViews around. You should check out the video from WWDC 2010 where they achieve this effect with the new GestureRecognizer Class.
The video you should look for is named somthing with "Gesture Recognition". If you don't find it I can link it when I'm home from work.
I wish you the best of luck!
HI,
I have a view that has three UIScrollViews on the screen. I want to randomly scroll the UIScrollViews to different positions whenever a user shakes the iPhone, but I am unable to get it done.
I have implemented the following in my ViewController class to detect and handle the shake gesture, the 3 UIScrollViews also belong to the same class. The shake gesture is detected, but the UIScrollViews do not change. What am I doing Wrong??
i have tried both motionBegan and motionEnded.
-(BOOL)canBecomeFirstResponder {
return YES;
}
-(void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake)
{
int randomTag = arc4random() % [dirContents count];
CGRect nextImageView = [[scrollView1 viewWithTag:2] frame];
[scrollView1 scrollRectToVisible:nextImageView animated:YES];
randomTag = arc4random() % [dirContents count];
nextImageView = [[scrollView2 viewWithTag:4] frame];
[scrollView2 scrollRectToVisible:nextImageView animated:YES];
randomTag = arc4random() % [dirContents count];
nextImageView = [[scrollView3 viewWithTag:4] frame];
[scrollView3 scrollRectToVisible:nextImageView animated:YES];
NSLog(#"Shake Detected End");
}
}
Thank You
Have you tried using SetContentOffset instead of scrollRectToVisible yet?
if the images in your tableView are of equal height the offset per "Element" is always the same.
[scrollView3 setContentOffset:yourRandomOffsetInPixels animated:YES];
maybe this works.
also consider, that The Problem might be that your shake-detection Method runs on a separate Thread this would mean that you have to call your motionEnded Method on the mainthread like so:
[self performSelectorOnMainThread:#selector(motionEnded) withObject:nil waitUntilDone:NO];
Did you check your nextImageView variable to see if it was correct ?
Further more if you are trying will have the motion of a slot machine, I would recommend you to use UITableView instead of doing it by yourself with scrollView
Just one quick question. In your example code, you generate a random tag:
randomTag = arc4random() % [dirContents count];
but then you use a specific tag value (4 in this case)? I assume it still doesn't work when you use the randomTag value? and that you were just doing some testing?
nextImageView = [[scrollView2 viewWithTag:4] frame];
Does anyone know if its possible to remove the shadow that is placed on the UIWebView window?
Example: http://uploadingit.com/files/1173105_olub5/shadow.png
If its possible how do you do it?
Thanks
This is a cleaner alternative to "Nikolai Krill" solution. This only hides UIImageViews within the UIWebView and not the UIWebBrowserView.
for (UIView *view in [[[webView subviews] objectAtIndex:0] subviews]) {
if ([view isKindOfClass:[UIImageView class]]) view.hidden = YES;
}
Thanks
James
the small for loop is very dangerous because it can crash if apple changes the number of the subviews.
this way it does at least not crash when something changes:
if ([[webView subviews] count] > 0)
{
for (UIView* shadowView in [[[webView subviews] objectAtIndex:0] subviews])
{
[shadowView setHidden:YES];
}
// unhide the last view so it is visible again because it has the content
[[[[[webView subviews] objectAtIndex:0] subviews] lastObject] setHidden:NO];
}
There is a private method with the selector setAllowsRubberBanding: that takes a BOOL value. If passed NO, you will not be able to scroll the web view past the top or bottom of the content area, but will still let you scroll through the web view normally. Unfortunately, this method IS private, and your app will likely not be allowed onto the store if you use it.
You could, however, potentially try and extract the method implementation and bind it to a different selector that you've created, using the dynamic nature of Objective-C's runtime.
Still, the method is private and may no longer exist in future versions of the OS. If you still want to try, here's some sample code that will extract the setAllowsRubberBanding: method implementation and call it for you.
static inline void ShhhDoNotTellAppleAboutThis (UIWebView *webview)
{
const char *hax3d = "frgNyybjfEhooreOnaqvat";
char appleSelName[24];
for (int i = 0; i < 22; ++i)
{
char c = hax3d[i];
appleSelName[i] = (c >= 'a' && c <= 'z') ? ((c - 'a' + 13) % 26) + 'a' : ((c - 'A' + 13) % 26) + 'A';
}
appleSelName[22] = ':';
appleSelName[23] = 0;
SEL appleSEL = sel_getUid(appleSelName);
UIScrollView *scrollView = (UIScrollView *)[webview.subviews objectAtIndex:0];
Class cls = [scrollView class];
if (class_respondsToSelector(cls, appleSEL) == NO)
{
return;
}
IMP func = class_getMethodImplementation(cls, appleSEL);
func(scrollView, appleSEL, NO);
}
Please note that this will probably still get caught by Apple's static analyzer if you choose to submit an app using this code to the AppStore.
Here is a Swift function that gets rid of the shadow in a UIWebView in iOS 9. It’s safer than any alternative I’ve seen on SO because everything in it is in Apple documentation, and it specifically alters the shadow property (as opposed to hiding the entire view or some other property of the view).
func removeShadow(webView: UIWebView) {
for subview:UIView in webView.scrollView.subviews {
subview.layer.shadowOpacity = 0
for subsubview in subview.subviews {
subsubview.layer.shadowOpacity = 0
}
}
}
You can always access the subviews property of a UIView(documentation). Every UIView has a layer property that is a CALayer (documentation). Every CALayer has shadowOpacity (documentation).
Caveats:
You might have to go deeper in navigating the view hierarchy through subviews depending on your situation.
This works as long as you don’t want any shadows anywhere in the web view controller. If you have a view where you want to keep the shadow (other than the default UIWebView shadow), then you could add an if-check to identify that view and not set that view’s layer’s shadowOpacity to zero.
According to Apple “For complex views declared in UIKit and other system frameworks, any subviews of the view are generally considered private and subject to change at any time. Therefore, you should not attempt to retrieve or modify subviews for these types of system-supplied views. If you do, your code may break during a future system update” . . . in other words, UIWebView can change and its not recommended to be digging into these subviews. However, digging into the UIWebView is the only way to get rid of the shadow and this is a relatively safe way to do it.
This can be done without use of private APIs. All you need to do is hide each UIImageView with the shadow in it. Heres the code:
for (int x = 0; x < 10; ++x) {
[[[[[webView subviews] objectAtIndex:0] subviews] objectAtIndex:x] setHidden:YES];
}
Try this
func webViewDidFinishLoad(_ webView: UIWebView) {
for shadowView in self.webView.scrollView.subviews {
if !shadowView.isKind(of: UIImageView.self) {
shadowView.subviews[0].layer.shadowColor = UIColor.clear.cgColor
} else {
shadowView.layer.shadowColor = UIColor.clear.cgColor
}
}
}
Traverse all subviews, the UIImageViews whose image is only 1 pixel wide are shadow images, you can hide them.
- (void)hideShadows {
[webview traverseViewsWithBlock:^(UIView *view) {
UIImageView *imgView = ([view isKindOfClass:[UIImageView class]] ? (UIImageView*)view : nil;
// image views whose image is 1px wide are shadow images, hide them
if (imgView && imgView.image.size.width == 1) {
imgView.hidden = YES;
}
}];
}
traverseViewsWithBlock does what it looks like:
- (void)traverseViewsWithBlock:(void (^)(UIView* view))block
{
block(self);
for (id subview in self.subviews) {
[subview traverseViewsWithBlock:block];
}
}
I looked at the class properties and didn't find anything there but I can think of two "cover up" strategies:
1. You can use another view (parent of the web view) to clip the webview bounds.
2. You can add another view on top of the webview to cover the needed area with a color that matches the background, you can use an uiimage with a transparent area in the center.
By the way I don't like this standard background of the table views :P, but changing it can be a pain in the ass :P
You have to be careful, the scroll indicators are UIImageViews as well.
I'll improve my code, but here's a basic subclassed solution:
http://forrst.com/posts/A_tiny_UIWebView_hack_remove_shadows_from_behi-gzH
The easiest way to hide scroll indicators and transparent the web view here in UIWebView
To remove the scrolls.
for(UIView *view in webView.subviews){
if ([view isKindOfClass:[UIScrollView class]]) {
UIScrollView *sView = (UIScrollView *)view;
//to hide verticalScroller
sView.showsVerticalScrollIndicator = NO;
sView.showsVerticalScrollIndicator = NO;
}
}
What about a category on UIWebView like this:
- (BOOL)showsScrollShadows
{
for(UIImageView *imageView in [self imageViewsWithShadows])
{
if(imageView.hidden)
{
return NO;
}
break;
}
return YES;
}
- (void)setShowsScrollShadows:(BOOL)showsScrollShadows
{
[[self imageViewsWithShadows] makeObjectsPerformSelector:#selector(setHidden:) withObject:#(!showsScrollShadows)];
}
- (NSArray *)imageViewsWithShadows
{
NSArray *potentialShadowImageViews = (self.subviews.count > 0) ? [self.subviews[0] subviews] : nil;
if(potentialShadowImageViews.count > 0)
{
NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings)
{
return [evaluatedObject isKindOfClass:[UIImageView class]];
}];
return [potentialShadowImageViews filteredArrayUsingPredicate:predicate];
}
return nil;
}
I've had a look around and can't see anything related to it. Apart from masking it with a view or clipping it somehow, the only thing I can think of is to loop through all of the UIWebView subviews (and sub-subviews etc.) and see if you can see anything there!
I may be wrong, but I think the shadow only shows up when we scroll the webview doesn't it ?
In that case, do you want to prevent the scrolling or really hide the shadow ? I don't know any tips that would hide the shadow. To disable the scrolling, I would setUserInteractionEnabled to NO.
I added a recursive method as a category to the UIView object so that it will do a depth-first walk of the subviews of the method's receiving view, hiding any UIImageView subclasses it finds. It will not crash if there are no subviews. The -apply: method is from BlocksKit. You could rewrite this function not to use it, but the block is applied in parallel to each element of the receiving array, so it's pretty fast.
#implementation UIView (RemoveShadow)
- (void)removeShadow {
if (self.subviews.count == 0 && [self isKindOfClass:[UIImageView class]]) {
self.hidden = YES;
} else if (self.subviews.count > 0) {
[self.subviews apply:^(id sender) {
[(UIView *)sender removeShadow];
}];
}
}
#end
if (UIDevice.currentDevice.systemVersion.intValue < 7)
for (UIImageView *imageView in webView.scrollView.subviews)
if ([imageView isKindOfClass:[UIImageView class]] && imageView.image.size.width == 1)
imageView.hidden = YES;
I have UIScrollView which has subviews (pictures) added do it. each time a user touches the a picture in the scrollview, it toggles a checkmark ontop of it.
NSMutableIndexSet *picturesArray; <- declared in .h
- (void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event {
if (!self.dragging) {
[self.nextResponder touchesEnded: touches withEvent:event];
NSLog(#"Touch down");
for (UITouch *touch in touches) {
for (int i = 1; i <= [self subviews].count; i++)
{
if(CGRectContainsPoint([[self viewWithTag:i]frame], [touch locationInView:self])){
NSLog(#"touched %d th view",i);
NSArray *subviews = [[self viewWithTag:i] subviews];
UIImageView *view = nil;
view = [subviews objectAtIndex:0];
if(view.hidden){
// add the index
[picturesArray addIndex:i];
view.hidden = NO; //check mark is shown
}else{
[picturesArray removeIndex:i];
view.hidden = YES; //check mark is not shown
}
// UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:i]image], nil, nil, nil); <- WORKS IF CALLED
}
}
}
}
Question 1: is this the best way of doing this? It seems like using a for (int i = 1; i <= [self subviews].count; i++) is pretty slow. I basically need to capture which subview was touched. I havent figured this out other than going through EACH subview
savePhotos is called and basically searches through which of the pictures was touched and saves them to the Photo Album. However the call to UIImageWriteToSavedPhotosAlbum fails. This is in the same file as TouchesEnded. But when called in TouchesEnded, it works.
(IBAction) savePhotos: (id) sender{
NSLog(#"The index set is %#",picturesArray );
const NSUInteger arrayCount = picturesArray.count;
NSUInteger *theIndexBuffer = (NSUInteger *)calloc(picturesArray.count, sizeof(NSUInteger));
UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:0]image], nil, nil, nil);
[picturesArray getIndexes:theIndexBuffer maxCount:arrayCount inIndexRange:nil];
for(int i = 0; i < arrayCount; i ++){
NSLog(#"Element is %d",theIndexBuffer[i]);
UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:i]image], nil, nil, nil); <- THIS CRASHES
}
}
Question 2: Why is it that UIImageWriteToSavedPhotosAlbum is failing ?
1) instead of using UIImageView, implement a child of UIImageView. Then try listening for touches on the individual subviews, that should solve your O(n) problem
2) something is probably getting auto-released, double check your reference counting is correct
try UIView* targetView = [self hitTest:location withEvent:nil];