properties

问题 I have read "What's new in Xcode",but I can't find the official explanation for this feature. Where can I find the official explanation? Which documentation? Thanks. 回答1: You can find this in the Apple documentation in Objective-C Programming Language: Declared Properties under "Property Implementation Directives". Whether or not an ivar is synthesized automatically depends on what runtime you are using: There are differences in the behavior of accessor synthesis that depend on the runtime

问题 I have read "What's new in Xcode",but I can't find the official explanation for this feature. Where can I find the official explanation? Which documentation? Thanks. 回答1: You can find this in the Apple documentation in Objective-C Programming Language: Declared Properties under "Property Implementation Directives". Whether or not an ivar is synthesized automatically depends on what runtime you are using: There are differences in the behavior of accessor synthesis that depend on the runtime

问题 In all the examples I see, C# auto-implemented properties are made public, even in the MSDN documentation examples. Coming from a C++ background, I've always been taught that it is a good idea to make member data private, unless there is a good reason not to. Why is the following never used (at least I've never seen it): private Name { get; set; } I've looked through the MSDN documentation and read several tutorials regarding auto-implemented properties but there does not seem to be any

问题 In short, when the property value changing, I have to update some logic in my code, for example: - (void)setProp:(NSString *)theProp { if (prop != theProp){ [prop release]; prop = [theProp copy]; [self myLogic]; } } or: - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqualToString:@"prop"]){ [self myLogic]; } } Which is the best way, and WHY? EDIT: I prefect the second way, because I don't know what

问题 I was just wondering if there is a quick and easy way of printing out to the log all of the various values of the properties to my class for debugging purposes. Like I would like to know what the values of all of the BOOLs, floats, etc. are. 回答1: This question seems the have the answer to your question. Update: I got curious and made a catagory: //Using Xcode 4.5.2 - iOS 6 - LLDB - Automatic Reference Counting //NSObject+logProperties.h @interface NSObject (logProperties) - (void)

问题 I have a program that loads lines from a user file, then selects the last part of the String (which would be an int) Here's the style it's saved in: nameOfValue = 0 nameOfValue2 = 0 and so on. I have selected the value for sure - I debugged it by printing. I just can't seem to save it back in. if(nameOfValue.equals(type)) { System.out.println(nameOfValue+" equals "+type); value.replace(value, Integer.toString(Integer.parseInt(value)+1)); } How would I resave it? I've tried bufferedwriter but

问题 Can someone give example of Dependency Property in ViewModel in WPF passed as datacontext to view. Will this require inheriting from DependencyObject? Lets say I want ListBox SelectedItem bound to a Dependency Property CurrentItem in ViewModel. I have it working from window object but same thing don't work with ViewModel . In ViewModel I use GetProperty and SetProperty and not CLR property. public partial class Window1 : Window { ObservableCollection<Person> persons; public

问题 I have a descriptor that turns a method into a property on the class level: class classproperty(object): def __init__(self, getter): self.getter = getter self.__doc__ = getter.__doc__ def __get__(self, instance, owner): return self.getter(owner) Used like this: class A(object): @classproperty def test(cls): "docstring" return "Test" However, I now can't access the __doc__ attribute (which is logical, because accessing A.test.__doc__ will fetch the __doc__ of str , because A.test already

问题 I have a descriptor that turns a method into a property on the class level: class classproperty(object): def __init__(self, getter): self.getter = getter self.__doc__ = getter.__doc__ def __get__(self, instance, owner): return self.getter(owner) Used like this: class A(object): @classproperty def test(cls): "docstring" return "Test" However, I now can't access the __doc__ attribute (which is logical, because accessing A.test.__doc__ will fetch the __doc__ of str , because A.test already

问题 I have a descriptor that turns a method into a property on the class level: class classproperty(object): def __init__(self, getter): self.getter = getter self.__doc__ = getter.__doc__ def __get__(self, instance, owner): return self.getter(owner) Used like this: class A(object): @classproperty def test(cls): "docstring" return "Test" However, I now can't access the __doc__ attribute (which is logical, because accessing A.test.__doc__ will fetch the __doc__ of str , because A.test already