I use bindings to NSObjectController within XIB. When I set new content object of NSObjectController the only textfield value which doesn't change is the one that has first responder. Model changes without an issue.
If I don't use custom getter/setter the textfield that has firstResponder (isBeingEdited) changes without an issue.
What's wrong with my KVC, KVO?
My custom getter/setter is below pic.
PS: I don't want to make window a first responder before I change content object to make it work.
static const CGFloat MMsInOneInch = 25.4;
static const CGFloat inchesInOneMM = 0.0393700787402;
- (void)setPaperWidth:(CGFloat)paperWidth
{
[self willChange];
CGFloat newWidth = paperWidth * [self conversionKoeficientToDefaultUnitType];
if (!_isChangingPaperSize) {
if (self.paperSize == PPPaperSizeA4 && fabs(newWidth - widthSizeOfA4) > 0.001) {
[self setPaperSize:PPPaperSizeCustom];
}
if (self.paperSize == PPPaperSizeUSLetter && fabs(newWidth - widthSizeOfUSLetter) > 0.001 ) {
[self setPaperSize:PPPaperSizeCustom];
}
}
[self willChangeValueForKey:#"paperWidth"];
_paperWidth = newWidth;
[self didChangeValueForKey:#"paperWidth"];
[self didChange];
}
- (CGFloat)conversionKoeficientToDefaultUnitType
{
if ([self defaultUnitType] == [self unitType]) {
return 1;
}
if ([self defaultUnitType] == PPPrintSettingsUnitTypeMM) {
return MMsInOneInch;
}
if ([self defaultUnitType] == PPPrintSettingsUnitTypeInch) {
return inchesInOneMM;
}
return 1;
}
- (CGFloat)paperWidth
{
return _paperWidth / [self conversionKoeficientToDefaultUnitType];
}
I forgot that I use NSNumberFormatter with min/max value which where blocking NSTextField to update.
Related
I have been using a similar method to as this:
https://github.com/oscardelben/CocoaNavigationGestures
To capture two finger swipes on the Mac, under Yosemite it is no longer working. Anyone know what has change, or what I need to change for this to work.
The accepted answer didn't work well for me - it would often not detect the swipe. Instead, I overrode wantsScrollEventsForSwipeTrackingOnAxis:(NSEventGestureAxis)axis to return YES for the appropriate axis, then overrode scrollWheel:(NSEvent *)theEvent to detect scrolling. Works perfect every time.
The complete answer in Swift 5.3, based on #bmuller would be:
override func wantsScrollEventsForSwipeTracking(on axis: NSEvent.GestureAxis) -> Bool {
return axis == .horizontal
}
override func scrollWheel(with event: NSEvent) {
if event.scrollingDeltaX < 0 {
print("Go forward")
}
else {
print("Go back")
}
}
Multiple swipe events might be sent in a single gesture with this code. You may need to add phase(NSEventPhase) handling code to the scrollWheel(...) function e.g.
override func scrollWheel(with event: NSEvent) {
guard event.phase == .began else {
return
}
if event.scrollingDeltaX < 0 {
print("Go forward")
}
else {
print("Go back")
}
}
On your Mac, go to system preferences and you will find all the different settings of the trackpad.
From here: https://discussions.apple.com/thread/5710582
Hope I helped.
This was my solution, seems to be working for me.
#define kSwipeMinimumLength 0.2
- (void)touchesBeganWithEvent:(NSEvent *)event{
if(event.type == NSEventTypeGesture){
NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseAny inView:self];
if(touches.count == 2){
self.twoFingersTouches = [[NSMutableDictionary alloc] init];
for (NSTouch *touch in touches) {
[self.twoFingersTouches setObject:touch forKey:touch.identity];
}
}
}
}
- (void)touchesMovedWithEvent:(NSEvent*)event {
NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseEnded inView:self];
if(touches.count > 0){
NSMutableDictionary *beginTouches = [self.twoFingersTouches copy];
self.twoFingersTouches = nil;
NSMutableArray *magnitudes = [[NSMutableArray alloc] init];
for (NSTouch *touch in touches)
{
NSTouch *beginTouch = [beginTouches objectForKey:touch.identity];
if (!beginTouch) continue;
float magnitude = touch.normalizedPosition.x - beginTouch.normalizedPosition.x;
[magnitudes addObject:[NSNumber numberWithFloat:magnitude]];
}
float sum = 0;
for (NSNumber *magnitude in magnitudes)
sum += [magnitude floatValue];
// See if absolute sum is long enough to be considered a complete gesture
float absoluteSum = fabsf(sum);
if (absoluteSum < kSwipeMinimumLength) return;
// Handle the actual swipe
// This might need to be > (i am using flipped coordinates), you can use an else to go forward also.
if (sum > 0){
NSLog(#"go back");
}
}
}
I want to change the default font for all UITextViews. It seems that the easiest way to do this is via custom category. I found this solution: Change the default systemFont used by controls and tried to implement it.
But my UITextViews are added programmatically so the awakeFromNib function is not called. I tried to move it to initWithFrame like this:
-(id)initWithFrame:(CGRect)frame
{
id result = [super initWithFrame:frame];
if (result) {
float size = [self.font pointSize];
NSString *stringfontstyle=self.font.fontName;
if([stringfontstyle rangeOfString:#"Bold"].location != NSNotFound) {
self.font = [UIFont fontWithName:#"Avenir-Black" size:size];
}
else if ([stringfontstyle rangeOfString:#"Italic"].location != NSNotFound) {
self.font = [UIFont fontWithName:#"Avenir-Oblique" size:size];
}
else if ([stringfontstyle rangeOfString:#"Medium"].location != NSNotFound) {
self.font = [UIFont fontWithName:#"Avenir-Medium" size:size];
}
else {
self.font = [UIFont fontWithName:#"Avenir-Roman" size:size];
}
}
return result;
}
Weird is that if my category contains initWithFrame function, the UITextView disappears. What is it that I'm missing?
Note: I'm using autoLayout so the initWithFrame is called with CGRectZero, but I suppose that isn't the problem.
EDIT:
The problem is that the font is null when the UITextView is initiated. So what method would be appropriate to place the code into?
when category contains a method, it overrides the class's method... and thats not good. subclassing would work.. method swizzling might be a way but...
why don't you just subclass UITextView - then you can keep your initWithFrame thingy or maybe override font
- (UIFont*)font {
if(!myFont) {
_myFont = xy;
}
id superFont = super.font;
if(![superFont.name isEqualTo:_myFont.name]) {
super.font = [myFont fontWithSize:superFont.pointSize];
}
return _myFont;
}
or setFont:
- (void)setFont:(UIFont*)newFont {
if(!myFont) {
_myFont = xy;
}
id thisFont = [_myFont fontWithSize:newFont.pointSize];
super.font = thisFont;
How do I make a CALayer accessible? Specifically, I want the layer to be able to change its label on the fly, since it can change at any time. The official documentation's sample code does not really allow for this.
The following assumes that you have a superview whose layers are all of class AccessableLayer, but if you have a more complex layout this scheme can be modified to handle that.
In order to make a CALayer accessible, you need a parent view that implements the UIAccessibilityContainer methods. Here is one suggested way to do this.
First, have each layer own its UIAccessibilityElement
#interface AccessableLayer : CALayer
#property (nonatomic) UIAccessibilityElement *accessibilityElement;
#end
now in its implementation, you modify the element whenever it changes:
#implementation AccessableLayer
... self.accessibilityElement.accessibilityLabel = text;
#end
The AccessableLayer never creates the UIAccessibilityElement, because the constructor requires a UIAccessibilityContainer. So have the super view create and assign it:
#pragma mark - accessibility
// The container itself is not accessible, so return NO
- (BOOL)isAccessibilityElement
{
return NO;
}
// The following methods are implementations of UIAccessibilityContainer protocol methods.
- (NSInteger)accessibilityElementCount
{
return [self.layer.sublayers count];
}
- (id)accessibilityElementAtIndex:(NSInteger)index
{
AccessableLayer *panel = [self.layer.sublayers objectAtIndex:index];
UIAccessibilityElement *element = panel.accessibilityElement;
if (element == nil) {
element = [[UIAccessibilityElement alloc] initWithAccessibilityContainer:self];
element.accessibilityFrame = [self convertRect:panel.frame toView:[UIApplication sharedApplication].keyWindow];
element.accessibilityTraits = UIAccessibilityTraitButton;
element.accessibilityHint = #"some hint";
element.accessibilityLabel = #"some text";
panel.accessibilityElement = element;
}
return element;
}
- (NSInteger)indexOfAccessibilityElement:(id)element
{
int numElements = [self accessibilityElementCount];
for (int i = 0; i < numElements; i++) {
if (element == [self accessibilityElementAtIndex:i]) {
return i;
}
}
return NSNotFound;
}
I want to use a wrapping text field that can potentially contain carriage returns in my app. Is there any way to force the NSTextField object to write a carriage return into the text area instead of sending its action to its target when the Return key is pressed?
This is covered in Technical Q&A QA1454, which also enumerates reasons why one would use NSTextField instead of NSTextView in this case.
You can implement the following method in the text field delegate:
- (BOOL)control:(NSControl*)control
textView:(NSTextView*)textView
doCommandBySelector:(SEL)commandSelector
{
BOOL result = NO;
if (commandSelector == #selector(insertNewline:))
{
// new line action:
// always insert a line-break character and don’t cause the receiver
// to end editing
[textView insertNewlineIgnoringFieldEditor:self];
result = YES;
}
return result;
}
Okay, I figured out one way to do it, but this very well may not be the best (or even a good) way. I subclassed NSTextField, and overrode -textShouldEndEditing: like so:
-(BOOL)textShouldEndEditing:(NSText *)textObject {
NSEvent * event = [[NSApplication sharedApplication] currentEvent];
if ([event type] == NSKeyDown && [event keyCode] == 36) {
[self setStringValue:[[self stringValue] stringByAppendingString:#"\n"]];
return NO;
}
else {
return [super textShouldEndEditing:textObject];
}
}
I found a combination of Sean and Bevarious worked best for me. Sean's answer assumes that the new line is always wanted to be added to the end (instead of for instance where the user's cursor is placed).
-(BOOL)textShouldEndEditing:(NSText *)textObject
{
NSEvent * event = [[NSApplication sharedApplication] currentEvent];
if ([event type] == NSKeyDown && [event keyCode] == 36)
{
[textObject insertNewlineIgnoringFieldEditor:nil];
return NO;
}
else
{
return [super textShouldEndEditing:textObject];
}
}
Swift version:
override func textShouldEndEditing(textObject: NSText) -> Bool {
let event = NSApplication.sharedApplication().currentEvent
if event?.type == NSEventType.KeyDown && event?.keyCode == 36 {
self.stringValue = self.stringValue.stringByAppendingString("\n")
return false
} else {
return super.textShouldEndEditing(textObject)
}
}
I want to get the name of a sender in Objective-C. For example, below I have a method which is called by an instance of UISlider in Interface Builder, I want to know what the instance name of it is so I can later add conditional blocks to the method for which instance of UISlider called the method.
e.g.
-(IBAction)sliderChanged:(UISlider *)sender {
//labAt1TimeRequired.text = [NSString stringWithFormat:#"%.1f", [sender value]];
NSLog(#"%#",sender);
Outputs:2010-10-15 22:46:02.257 EPC[3225:207] <UISlider: 0x495b140; frame = (205 3; 118 23); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x492e340>>
I want to be able to say
if(sender==myInstanceName) {
//do this
}
You could use
.tag member
to read an write and integer ID for the slider like this:
-(IBAction)sliderChanged:(UISlider
*)sender {
switch (sender.tag) {
case 0:
//SLider 0
break;
case 1:
//SLider 1
break;
default:
break;
}
}
Tag ID's can also be set for components in IB.
If your set on a string then you would need to subclass a UISlider.
You would use the tag property of UIView for identifying the sender.
-(IBAction)sliderChanged:(UISlider *)sender {
//labAt1TimeRequired.text = [NSString stringWithFormat:#"%.1f", [sender value]];
if (sender.tag == 1)
{
// do whatever
}
else
{
// do something else
}
}