I made a custom NSFormatter subclass and want to return an error message
however assigning the error and returning valid = NO doesn't do the trick (no error is shown)
- (BOOL)isPartialStringValid:(NSString **)partialStringPtr
proposedSelectedRange:(NSRangePointer)proposedSelRangePtr
originalString:(NSString *)origString
originalSelectedRange:(NSRange)origSelRange
errorDescription:(NSString **)error
{
BOOL valid = YES;
NSString *proposedString = *partialStringPtr;
if ([proposedString length] < self.minLength) {
*error = #"TOO SHORT";
valid = NO;
}
return valid;
}
I don't use bindings
I think that you problem because NSControl (which validates user input) don't has delegate with implemented method (dcumentation):
control:didFailToValidatePartialString:errorDescription:
If you want that #"TOO SHORT" displays in text field instead of user inputed string you can return #"TOO SHORT" in newString of method:
- (BOOL)isPartialStringValid:(NSString *)partialString
newEditingString:(NSString **)newString
errorDescription:(NSString **)error
Related
I want to customize text for the same information but when I am sharing it on Facebook I don't want to use the twitter hash tags or #username scheme...
How can I diversify text for sharing based on which sharing service would be used?
Ofcourse I'm using UIActivityViewController:
UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:#[shareText, shareURL] applicationActivities:nil];
I took this answer and made a simple class for it. The default message will be seen by sharing outlets other than Twitter, and for Twitter words within the hashWords array will appear with hashes if they are present in the default message. I thought I would share it for anyone else who needs it. Thanks Christopher!
Usage:
TwitterHashActivityItemProvider *twit = [[TwitterHashActivityItemProvider alloc] initWithDefaultText:#"I really like stackoverflow and code"
hashWords:#[#"stackoverflow", #"code"]];
NSArray *items = #[twit];
UIActivityViewController *act = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];
Header:
#interface TwitterHashActivityItemProvider : UIActivityItemProvider
- (id)initWithDefaultText:(NSString*)text hashWords:(NSArray*)hashItems;
#property (nonatomic,strong) NSArray *hashItems;
#end
Implementation:
#import "TwitterHashActivityItemProvider.h"
#implementation TwitterHashActivityItemProvider
- (id)initWithDefaultText:(NSString*)text hashWords:(NSArray*)hashItems;
{
self = [super initWithPlaceholderItem:text];
if ( self )
{
self.hashItems = hashItems;
}
return self;
}
- (id)item
{
if ( [self.placeholderItem isKindOfClass:[NSString class]] )
{
NSString *outputString = [self.placeholderItem copy];
// twitter gets some hash tags!
if ( self.activityType == UIActivityTypePostToTwitter )
{
// go through each potential hash item and augment the main string
for ( NSString *hashItem in self.hashItems)
{
NSString *hashed = [#"#" stringByAppendingString:hashItem];
outputString = [outputString stringByReplacingOccurrencesOfString:hashItem withString:hashed];
}
}
return outputString;
}
// else we didn't actually provide a string...oops...just return the placeholder
return self.placeholderItem;
}
#end
Instead of passing the text strings into the initWithActivityItems call, pass in your own sub-class of the UIActivityItemProvider class and when you implement the itemForActivityType method it will provide the sharing service as the 'activityType' parameter.
You can then return the customized content from this method.
Swift implementation example of an UIActivityItemProvider subclass. Copy option will use only the password, other activity types will use the full share text. Should be easy to customize for different use cases. Credit to Cristopher & NickNack for their answers.
class PasswordShareItemsProvider: UIActivityItemProvider {
private let password: String
private var shareText: String {
return "This is my password: " + password
}
init(password: String) {
self.password = password
// the type of the placeholder item is used to
// display correct activity types by UIActivityControler
super.init(placeholderItem: password)
}
override var item: Any {
get {
guard let activityType = activityType else {
return shareText
}
// return desired item depending on activityType
switch activityType {
case .copyToPasteboard: return password
default: return shareText
}
}
}
}
Usage:
let itemProvider = PasswordShareItemsProvider(password: password)
let activityViewController = UIActivityViewController(activityItems: [itemProvider], applicationActivities: nil)
Is there a way to block some keyboard layouts (input sources) in NSTextField.
I need to block all non-romans languages such as Russian, Belorussian, Ukraine and etc or disable all languages and enable only English/Deutsch language.
If it will be not so hard - make some example please.
UPD:
I think i need to use this
but how? =)
Checking just the keyboard attached is maybe a bit flakey. With the Option key you can input a lot non-Roman characters from any keyboard, for instance. Not to mention copy and paste.
A better approach would be to make a subclass of NSFormatter and implement isPartialStringValid:proposedSelectedRange:originalString:originalSelectedRange:errorDescription:
A simple implementation could be something like this:
- (BOOL)isPartialStringValid:(NSString **)partialStringPtr proposedSelectedRange:(NSRangePointer)proposedSelRangePtr originalString:(NSString *)origString originalSelectedRange:(NSRange)origSelRange errorDescription:(NSString **)error
{
NSString *partialString = *partialStringPtr;
NSCharacterSet *acceptedCharacters = [NSCharacterSet characterSetWithCharactersInString: #"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"];
NSCharacterSet *notAcceptedCharacters = [acceptedCharacters invertedSet];
BOOL needsCheck = YES;
BOOL didChange = NO;
do {
NSRange rng = [partialString rangeOfCharacterFromSet:notAcceptedCharacters];
if ( !NSEqualRanges(rng, NSMakeRange(NSNotFound, 0)) ) {
partialString = [partialString stringByReplacingCharactersInRange:rng withString:#""];
didChange = YES;
}
else {
needsCheck = NO;
}
} while (needsCheck);
if ( didChange ) {
*partialStringPtr = partialString;
NSRange newRange = origSelRange;
newRange.length = 0;
*proposedSelRangePtr =newRange;
return NO;
}
return YES;
}
When subclassing NSFormatter you are also required to implement stringForObjectValue: and getObjectValue:forString:errorDescription:, but since you are inputting a string, they can just pass the input string straight through.
in an NSViewController subclass this BOOL returns "fault is (null)" in the console:
Submission *sub = [self representedObject];
BOOL fault = [sub isFault];
NSLog(#"fault is : %#", fault);
i do have the sub managedObject's properties, so i know that its available.
testing with committedValuesForKeys (right below the above in the same method) gives me the expected property values in the console.
NSLog(#"[sub committedValuesForKeys:nil] is : %#", [sub
committedValuesForKeys:nil]);
self here is an NSCollectionViewItem, a subclass of NSViewController.
There are some other cleaner ways to do this:
BOOL fault = YES;
NSLog(fault ? #"Yes" : #"No");
and
BOOL fault = YES;
NSLog(#"Bool fault: %d",fault);
via How to print Boolean flag in NSLog?
You can't check the BOOLs value like that. Instead do:
if (fault) {
NSLog(#"Fault is true");
} else {
NSLog(#"Fault is false");
}
I have 2 SOAP services that I want to call from an IPad app.
One is used to Log the user in (SecurityASMX), the other is one that returns the current username (SecuredCalls) once logged in.
I can call the SecurityASMX no problem using the following code. The Async call callback is operation :
- (IBAction) OnButtonClick:(id) sender {
bindingSecurity = [[SecurityASMXSvc SecurityASMXSoapBinding] initWithAddress:#"http://myserver/Azur.IPADTest.Web.Services/public/Security.asmx"];
bindingSecurity.logXMLInOut = YES;
SecurityASMXSvc_Login *requestLogin = [[SecurityASMXSvc_Login alloc] init];
requestLogin.strUsername = #"test";
requestLogin.strPassword = #"testpass";
[bindingSecurity LoginAsyncUsingParameters:requestLogin delegate:self];
[requestLogin release];
self.label.text = #"Login in progress";
}
- (void) operation:(SecurityASMXSoapBindingOperation *)operation completedWithResponse:(SecurityASMXSoapBindingResponse *)response
{
[NSThread sleepForTimeInterval:2.0];
self.label.text = #"Login Done!";
}
This works fine.
However, in the same code file, I have a binding to my second web service to return the username with the following code. The async call callback is operationSecure :
- (IBAction) OnButtonSecureCallClick:(id) sender {
bindingSecuredCalls = [[SecureCallsSvc SecureCallsSoapBinding] initWithAddress:#"http://myserver/Azur.IPADTest.Web.Services/private/SecureCalls.asmx"];
bindingSecuredCalls.logXMLInOut = YES;
SecureCallsSvc_ReturnUserName *requestReturnUserName = [[SecureCallsSvc_ReturnUserName alloc] init];
[bindingSecuredCalls ReturnUserNameAsyncUsingParameters:requestReturnUserName delegate:self];
[requestReturnUserName release];
self.label.text = #"Get UserName In Progress";
}
- (void) operationSecure:(SecureCallsSoapBindingOperation *)operation completedWithResponse:(SecureCallsSoapBindingResponse *)response
{
[NSThread sleepForTimeInterval:2.0];
self.label.text = #"Get Username Done!";
}
The problem is that when the call to ReturnUserName returns, the method that gets called is the one for the login (operation) and not the one I want (operationSecure).
How can I tell my second webservice binding to call the second callback?
Thanks!
First thing would be to check if the API you're using (I assume it's a third party API) allows you to specify the callback method.
If not, you can work with the operation parameter and use isKindOfClass to see what is actually being passed.
- (void) operation:(SecurityASMXSoapBindingOperation *)operation completedWithResponse:(SecurityASMXSoapBindingResponse *)response
{
[NSThread sleepForTimeInterval:2.0];
if([operation isKindOfClass:[SecurityASMXSoapBindingOperation class]])
{
self.label.text = #"Login Done!";
}
else if([operation isKindOfClass:[SecureCallsSoapBindingOperation class]])
{
self.label.text = #"Get Username Done!";
}
}
Ideally you'd set the type of operation and response parameters to be the superclass of the respective objects returned.
I keep getting Clang errors on the following type of code and I can't figure out why they're erroneous or how to resolve them to Clang's satisfaction:
+ (NSString *)checkForLength: (NSString *)theString error: (NSError **)error {
BOOL hasLength = ([theString length] > 0);
if (hasLength) return theString;
else {
*error = [NSError errorWithDomain:#"ErrorDomain" code:hasLength userInfo:nil];
return nil;
}
}
Leaving aside the utterly-contrived nature of the example (which Clang did object to so it's illustrative enough), Clang balks at the error assignment line with the following objection:
Potential null dereference. According to coding standards in 'Creating and Returning NSError Objects' the parameter 'error' may be null.
I like having a pristine Clang report. I've read the cited document and I can't see a way to do what's expected; I checked some open-source Cocoa libraries and this seems to be a common idiom. Any ideas?
The way to do what's expected is shown in listing 3-5 in that document. With your example code:
+ (NSString *)checkForLength: (NSString *)theString error: (NSError **)error {
BOOL hasLength = ([theString length] > 0);
if (hasLength) return theString;
else {
if (error != NULL) *error = [NSError errorWithDomain:#"ErrorDomain" code:hasLength userInfo:nil];
return nil;
}
}
The Cocoa convention is that the return value should indicate success or failure (in this case, you return nil for failure) and the error is filled in with additional information, but only when the caller requests it.
In other words
NSError *error = nil;
NSString *result = [self checkForLength: aString error: &error];
and
NSString *result = [self checkForLength: aString error: NULL];
are both valid ways to invoke the method. So the method body should always check for a NULL error param:
if (error != NULL)
*error = ...;