I'm doing something slightly or monumentally wrong.
I want to swap a UIColour for a programmable variable, for example:
NSString *DataColourTitle = #"greenColor";
[[UINavigationBar appearance] setTintColor: [UIColor [NSString stringWithFormat: #"%#", DataColourTitle]]];
I'm getting an Expected Identifier error at the NSString part and haven't worked out the formatting required to accomplish this.
The syntax for calling a class method of UIColor would be [UIColor <#some selector#>] where <#some selector#> is an identifier such as greenColor, not a string. The selector that it expects is a reference to code that can return a UIColor object, whereas #"greenColor" is just a static, literal string of bytes wrapped up as a NSString object.
Try something like:
SEL green = NSSelectorFromString(#"greenColor");
UIColor *color = [UIColor performSelector:green];
[[UINavigationBar appearance] setTintColor: color];
Related
Im making an iOS app to do with currency. My app receives the value of maybe: $4. This value the app receives is put into an NSNumber. The trouble is the value actualy has a $ in it. How do I trim out the $ in the NSNumber? Or would I be better of putting it into an NSString?
Use NSNumberFormatter:
// set up your number formatter
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
// get a string that you'll be converting to a NSNumber
NSString *myNumberString = [NSString stringWithFormat:#"$4"]
// convert then print to the console
NSNumber *myNumber = [numberFormatter numberFromString:myNumberString];
NSLog(#"myNumber: %#", myNumber);
This should accomplish what you're looking to do. myNumberString will need to be altered to contain whatever string you're receiving.
NSNumberFormatter Documentation: https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html
I've got an Label (NSTextField) in IB that's bound to a controller.
The controller, on awakeFromNIB, sets the attributedStringValue of the label to contain some coloured text and a link or two.
When you see the label it contains the correct string value, but some of the formatting is lost - until you click on the label, and it updates to contain the correct formatting.
I'm using this code to set the value:
[self.testTextField setAllowsEditingTextAttributes:YES];
[self.testTextField setSelectable:YES];
NSMutableAttributedString *linkString = [[NSMutableAttributedString alloc] initWithString:#"hit this "];
[linkString beginEditing];
NSMutableAttributedString* attrString = [[NSMutableAttributedString alloc] initWithString:#"link"];
NSRange range = NSMakeRange(0, [attrString length]);
[attrString addAttribute:NSLinkAttributeName value:[[NSURL URLWithString:#"http://google.com"] absoluteString] range:range];
[attrString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:NSUnderlinePatternDot] range:range];
[attrString addAttribute:NSForegroundColorAttributeName value:[NSColor blackColor] range:range];
[linkString appendAttributedString:attrString];
[linkString appendAttributedString:[[NSAttributedString alloc] initWithString:#" to search"]];
[linkString addAttribute:NSForegroundColorAttributeName value:[NSColor redColor] range:NSMakeRange(0, [linkString length])];
[linkString endEditing];
[self.testTextField setAttributedStringValue:linkString];
Based on this example, you'll see the string coloured red and in the default Label font.
Then when you click on the label the font changes size and face and the link magically renders.
Any ideas on how to get the string to render correctly the first time?
I ran into this same problem. The solution I found was to explicitly set the NSFontAttributeName on the attributed string. I created an NSFont object that matched the font I had set in IB for my textfield and set that attribute like so:
NSFont *font = [NSFont fontWithName:#"Lucida Grande" size:(CGFloat)13.0];
[attrString addAttribute:NSFontAttributeName value:font range:range];
As far as I know that's just normal AppKit weirdness.
I've had success using this custom class to render text fields as links, you just add it in interface builder and set its attributed string value like normal:
DSClickableURLTextField / Swift DSClickableURLTextField fork.
You also have the option of using an NSButton, though that's more of a pain, and you don't get the hand cursor without extra work.
I have a GUI built on IB (Xcode 4).
It has a Static Text field connected to an NSTextField. After reading the information from an XML file it's supposed to change the text to whatever it is coming from the XML
the .h is as follow:
IBOutlet NSTextField * DataBaseLocation;
the .m
NSMutableArray* DBLoc = [[NSMutableArray alloc] initWithCapacity:1];
NSXMLElement* root = [doc rootElement];
NSArray* DBarray = [root nodesForXPath:#"//DataBaseLocation" error:nil];
for(NSXMLElement* xmlElement in DBarray)
[DBLoc addObject:[xmlElement stringValue]];
NSString * DBLocationString = [DBLoc objectAtIndex:0];
[DataBaseLocation setStringValue:DBLocationString];
NSLog(#"DBLoc: %#", DBLoc);
The NSLog shows that DBLoc has the correct string, yet the Text Field is empty and never gets set.
yes, I checked the connections in IB.
Any ideas? thanks!
Found the answer.
I needed to initialize the NSXMLDocument with NSXMLDocumentTidyXML like:
NSXMLDocument* doc = [[NSXMLDocument alloc] initWithContentsOfURL: [NSURL fileURLWithPath:input] options:NSXMLDocumentTidyXML error:NULL];
You should print out DBLocationString instead of DBLoc to make sure it's not empty or in some corrupted format that can't be passed as a string value and go from there.
I'm trying to display an image in a NSImageView, with an image contained in a Byte array. How can I do this? From what I understand I need to convert my byte[] to an NSData variable and feed that to an NSImage. Is this correct? How do I do it? I've tried casting and that doesn't work, and there doesn't seem to be any conversion built in...
I have tried the following:
Casting:
NSData bytesAsMacVariable = (NSData) imageAsBytes;
Also tried
NSData bytesAsMacVariable = imageAsBytes as NSData;
Finally, tried to pass a byte[] as if it was a NSData.
NSImage imageToShow = new NSImage(imageAsBytes);
None of these will work, and as far as I can see, neither NSImage or NSData has a member function that accepts byte[] for conversion...
You're casting to the object type, but you should cast to pointer-to-object type.
Try something more like
NSData *imageData = [NSData dataWithBytes:byteArray length:arrayLength];
NSImage *image = [[NSImage alloc] initWithData:imageData];
[imageView setImage:image];
[image release];
The pointers are very important.
You can use an NSMutableData, like this:
new NSImage (new NSMutableData (imageAsBytes));
I'm not sure what I'm doing wrong. I have a NSTextView and am registered as the delegate for its textStorage attribute. When I receive -textStorageDidProcessEditing:notification: I'm trying to apply attributes to ranges of characters within the text. It certainly does "something" to the characters, but not what I expect... they just disappear!
A heavily distilled code example. This should make sure the second character in the text field is always red:
-(void)textStorageDidProcessEditing:(NSNotification *)notification {
NSTextStorage *textStorage = [textView textStorage];
if ([[textStorage string] length] > 1) {
NSColor *color = [NSColor redColor];
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:color, NSForegroundColorAttributeName, nil];
[textStorage setAttributes:attributes range:NSMakeRange(1, 1)];
}
}
Instead, as I type the sequence "abcdefg" I get "a", then when I hit "b" seemingly nothing happens, then when I hit "cdefg" typing occurs as normal, making the end result "acdefg"... the "b" is missing!
If I start hitting backspace I have to hit backspace 7 times, as if the "b" is actually there, but just not being drawn (cursor stalls as it deletes the "b", then on the next backspace deletes the "a" as expected).
If I apply attributes to some default text in the view using the same -setAttributes:range: method before the view is drawn then it does exactly as I expect.
Any clues? It seems like a fairly normal use of a NSTextStorageDelegate :)
I've tried calling -setNeedsDisplay on the text field to no avail.
Figured it out. Using NSTextStorage's -addAttribute:value:range works. I still don't fully understand why but at least I can get over it and move on.
-(void)textStorageDidProcessEditing:(NSNotification *)notification {
// ... SNIP ...
[textStorage addAttribute:NSForegroundColorAttributeName
value:[NSColor redColor]
range:NSMakeRange(1, 1)];
}
Makes the code a bit less cluttered too.
I'm not sure how relevant this is for you after so many years but I think the reason for it was that you were setting attributes with a dictionary which does not contain NSFontAttributeName, effectively removing it from the textview.
So I think this should work:
-(void)textStorageDidProcessEditing:(NSNotification *)notification {
NSTextStorage *textStorage = [textView textStorage];
if ([[textStorage string] length] > 1) {
NSColor *color = [NSColor redColor];
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:color, NSForegroundColorAttributeName, [NSFont ...whatever...], NSFontAttributeName, nil];
[textStorage setAttributes:attributes range:NSMakeRange(1, 1)];
}
}