objective-c-2.0

Does Objective-C support Mixin like Ruby?

由 落花浮王杯 提交于 2019-12-18 10:50:38
问题 In Ruby, there's Modules and you can extend a class by "mixing-in" the module. module MyModule def printone print "one" end end class MyClass include MyModule end theOne = MyClass.new theOne.printone >> one In Objective-C, I find that I have a set of common methods that I want a number of Class to "inherit". What other ways can I achieve this without creating a common class and deriving all from that common class? 回答1: Edit : changes added because some people feel I am responsible for the

Difference between two dates for countdown timer implementation [closed]

由 丶灬走出姿态 提交于 2019-12-11 18:39:39
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . How is possible that the difference between two dates is wrong (2013-04-04T19:14:58+02:00-2013-04-03T18:14:58+02:00) ? The result of the code is 01 days

So what's the deal with ARC and releasing properties/subviews on viewDidUnload

由 懵懂的女人 提交于 2019-12-11 10:52:42
问题 I'm still learning iOS development and have been working with various tutorials and books. Some pre-ARC, some with ARC. In some cases, we're taught to release all of the properties and subviews of a ViewController on viewDidUnload but in some cases I've been told this is no longer required. Can someone give a definitive answer? In iOS 5+, does one have to do the whole: -(void)viewDidUnload { [super viewDidUnload]; self.photoViewCell = nil; self.photoImageView = nil; self.firstNameTextField =

How to create randomly selected NSString “package” for iPhone app

由 风格不统一 提交于 2019-12-11 08:17:45
问题 I'm just delving into Objective C and Cocoa Touch and I'm trying to build an app for personal use. My goal is to create an app that displays a randomized NSString in a center window on the iPhone screen while also displaying a scrollable list of associated NSStrings in another window on the side of the screen. For example: if the center NSString is the name of an animal, such as "Lion", the NSStrings on the list next to it would also be animals (e.g., "Tiger", Snow Leopard", etc.) I would

Objective-C Address of property expression

由 為{幸葍}努か 提交于 2019-12-07 01:54:14
问题 I need access address of property but have problem. example code is @interface Rectangle : NSObject { SDL_Rect wall; SDL_Rect ground; } @property SDL_Rect wall; @property SDL_Rect ground; @end @implementation Rectangle @synthesize x; @synthesize y; @end @interface Graphics : NSObject { int w; int h; } -(void) drawSurface @end @implementation Graphics -(void) drawSurface { Rectangle *rect = [[Rectangle alloc] init]; SDL_BlitSurface(camera, NULL, background, &rect.wall); } @end &rect.x is

How to test property existence and type based on NSString typed key?

由 让人想犯罪 __ 提交于 2019-12-06 03:31:14
问题 In my quest to update a Core Data model within my iOS project, I'm querying a server for JSON objects that correspond - to some extent - with the managed entities of my model. The end result I'm striving for is a reliable update solution from JSON output. For the examples in this question, I'll name the core data managed object existingObj and the incoming JSON deserialized dictionary updateDict . The tricky part is dealing with these facts: Not all properties of the existingObj are present

Objective-C Address of property expression

由 有些话、适合烂在心里 提交于 2019-12-05 08:17:59
I need access address of property but have problem. example code is @interface Rectangle : NSObject { SDL_Rect wall; SDL_Rect ground; } @property SDL_Rect wall; @property SDL_Rect ground; @end @implementation Rectangle @synthesize x; @synthesize y; @end @interface Graphics : NSObject { int w; int h; } -(void) drawSurface @end @implementation Graphics -(void) drawSurface { Rectangle *rect = [[Rectangle alloc] init]; SDL_BlitSurface(camera, NULL, background, &rect.wall); } @end &rect.x is Address of property expression requested As the comments suggest, you cannot take the address of a property.

Xcode: How To Create A PopUp View Controller That Appears In Another View Controller

由 烈酒焚心 提交于 2019-12-03 03:55:21
问题 Basically what I am trying to figure out to do is, say I have one View Controller, called V1, that has a regular view inside it and a button. Now, when you tap that button, I want that button to create an action that pop-ups another View Controller, called V2, within the same view controller, V1. V2 will be reduced in size some so that it does not fill the entire screen, but you can still see the first layer which is V1 behind V2. So basically, you never really leave V1. I hope this makes

Xcode: How To Create A PopUp View Controller That Appears In Another View Controller

由 空扰寡人 提交于 2019-12-02 17:19:56
Basically what I am trying to figure out to do is, say I have one View Controller, called V1, that has a regular view inside it and a button. Now, when you tap that button, I want that button to create an action that pop-ups another View Controller, called V2, within the same view controller, V1. V2 will be reduced in size some so that it does not fill the entire screen, but you can still see the first layer which is V1 behind V2. So basically, you never really leave V1. I hope this makes sense for what I'm trying to do. I know the MTV app has this functionity. An image of what I'm talking

Passing Click Through Transparent Window

由 空扰寡人 提交于 2019-12-01 13:30:51
I have a fullscreen transparent window. When the user clicks on it I want the click to be sent to what's underneath the window. How would I do so? Setting IgnoresMouseEvents to YES should do the trick.. (void)setIgnoresMouseEvents:(BOOL)ignoreMouseEvents Specifies whether the window is transparent to mouse clicks and other mouse events, allowing overlay windows. http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/Reference/Reference.html#//apple_ref/occ/instm/NSWindow/setIgnoresMouseEvents : 来源： https://stackoverflow.com/questions
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