2014/10/15 下午 10:08:26

iphone Programming Glossary: equality

http://stackoverflow.com/questions/1292862/nsstring-isequal-vs-isequaltostring

states Special Considerations When you know both objects are strings this method is a faster way to check equality than isEqual . isEqualTo Class is used to provide specific checks for equality. For instance isEqualToArray checks that.. this method is a faster way to check equality than isEqual . isEqualTo Class is used to provide specific checks for equality. For instance isEqualToArray checks that the arrays contain an equal number of objects and that the objects at a given index..

how to remove subviews from scrollview?

http://stackoverflow.com/questions/1310723/how-to-remove-subviews-from-scrollview

can send them removeFromSuperview individually as necessary Add an if statement to the above loop checking for class equality. For example to only remove all the UIButtons or custom subclasses of UIButton that exist in a view you could use something..

Strange problem comparing floats in objective-C

http://stackoverflow.com/questions/1614533/strange-problem-comparing-floats-in-objective-c

to a float. So I do this if self.scroller.currentValue 0.1 where currentValue is a float property. However when I have equality and self.scroller.currentValue 0.1 the if statement is not fulfilled and the code not executed I found out that I can fix..

iphone / Objective C - Comparing doubles not working

http://stackoverflow.com/questions/4732645/iphone-objective-c-comparing-doubles-not-working

iphone objective c ios floating point share improve this question Don't ever compare doubles or floats with equality they might look the same at the number of significant figures your are examining but the computer sees more. Try something..

iPhone: Resign Keyboard with Done button action with XIB

http://stackoverflow.com/questions/4750606/iphone-resign-keyboard-with-done-button-action-with-xib

text Any new character added is passed in as the text parameter if text isEqualToString @ n Be sure to test for equality using the isEqualToString message textView resignFirstResponder Return FALSE so that the final ' n' character doesn't get..

What is the right way to check for a null string in Objective-C?

http://stackoverflow.com/questions/968792/what-is-the-right-way-to-check-for-a-null-string-in-objective-c

class is pointlessly complex since NSNull null is documented to be a singleton so you can just check for pointer equality. See Topics for Cocoa Using Null . So a good test might be if title id NSNull null title.length 0 title @ Something Note..