[NOTE This answer was originally formulated under Swift 2.2. It has been revised for Swift 4, involving two important language changes: the first method parameter external is no longer automatically suppressed, and a selector must be explicitly exposed to Objective-C.] You can work around this problem by casting your function reference to the correct method … Read more
This is Brad Cox. My original answer misunderstood the question. I assumed reallyFast was a hardcoded extension to trigger faster messaging, not a kind of syntactic sugar. The real answer is that Smalltalk didn’t support it, perhaps because its parser couldn’t deal with the (assumed) ambiguity. Although OC’s square brackets would remove any ambiguity, I … Read more
Use jQuery .siblings() to select the matching sibling. $(this).siblings(‘.bidbutton’);
use this way: <?xml version=”1.0″ encoding=”utf-8″?> <selector xmlns:android=”http://schemas.android.com/apk/res/android”> <item android:state_pressed=”true” > <shape>…….</shape> </item> ………. ………. </selector>
Personally, I think that a closer solution to your needs is the use of NSInvocation. Something like the following will do the work: indexPath and dataSource are two instance variables defined in the same method. SEL aSelector = NSSelectorFromString(@”dropDownSelectedRow:withDataSource:”); if([dropDownDelegate respondsToSelector:aSelector]) { NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[dropDownDelegate methodSignatureForSelector:aSelector]]; [inv setSelector:aSelector]; [inv setTarget:dropDownDelegate]; [inv setArgument:&(indexPath) atIndex:2]; … Read more
Another late answer, but none of the existing answers on this question really answer the OP’s question, which is: why the heck would you need to use @objc on a private class member, if @objc is there for interaction with Objective-C, and the member in question is private, meaning that even if you have Objective-C … Read more
You need to also create a ColorStateList for text colors identifying different states. Do the following: Create another XML file in res\color named something like text_color.xml. <?xml version=”1.0″ encoding=”utf-8″?> <selector xmlns:android=”http://schemas.android.com/apk/res/android”> <!– disabled state –> <item android:state_enabled=”false” android:color=”#9D9FA2″ /> <item android:color=”#000″/> </selector> In your style.xml, put a reference to that text_color.xml file as follows: <style … Read more
Basically performSelector allows you to dynamically determine which selector to call a selector on the given object. In other words the selector need not be determined before runtime. Thus even though these are equivalent: [anObject aMethod]; [anObject performSelector:@selector(aMethod)]; The second form allows you to do this: SEL aSelector = findTheAppropriateSelectorForTheCurrentSituation(); [anObject performSelector: aSelector]; before you … Read more
[NSObject cancelPreviousPerformRequestsWithTarget:] or [NSObject cancelPreviousPerformRequestsWithTarget:selector:object:] The target is the original object on which performSelector:afterDelay: was called. For example: // schedule the selector [self performSelector:@selector(mySel:) withObject:nil afterDelay:5.0]; // cancel the above call (and any others on self) [NSObject cancelPreviousPerformRequestsWithTarget:self]; See apple docs, it’s right at the end of the performSelector:withObject:afterDelay: description.
You have to be very careful about the method names. In this case, the method name is just “lowercaseString“, not “lowercaseString:” (note the absence of the colon). That’s why you’re getting NO returned, because NSString objects respond to the lowercaseString message but not the lowercaseString: message. How do you know when to add a colon? … Read more