cocoa-design-patterns

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How to share a ManagedObjectContext when using UITabBarController

I have an iPhone application that has a MainWindow.xib holding a UITabBarController, which in turn has a UINavigationController and a custom UIViewController subclass in its ViewControllers array. The[详细]

2022-12-16 23:55 分类：问答
Objective C terminology: outlets & delegates

I\'m having issues understanding the concept of outl开发者_StackOverflow社区ets how the iPhone deals with events. Help! Delegates confuse me too. Would someone care to explain, please?Outlets (in Inte[详细]

2022-12-16 23:14 分类：问答
How to tell if an object has already been allocated, so it isn't allocated multiple times?

Please be nice.. I am a noob with this stuff. I want to allocate and use an object through a method that I call many times, and instead of making it a global variable and allocating it in my initWithF[详细]

2022-12-16 10:22 分类：问答
Disclosure "i" button or chevron for iPhone app?

I have a开发者_如何转开发 UITableView with rows that each have two actions that can be performed. The user can be shown the item details screen (edit the name and see summary info) or they can \'open\[详细]

2022-12-16 00:50 分类：问答
Using NSPredicate with Core Data for deep relationships

I have an NSArrayController, companiesController bound to a t开发者_如何学编程op level Core Data entity, Companies.[详细]

2022-12-16 00:46 分类：问答
How to add (id) sender to the following -(IBAction)?

How do you add a (id) sender to the following code? - (IBAction) gobutton: (UIButton *) button5 { Everything I try开发者_如何学C fails, any help would be appreciated. Thanks.[详细]

2022-12-15 22:27 分类：问答
Why does UITableView make so many calls to its delegate & datasource?

Anyone care to shed some light on why UITableView makes so many repeat calls to its delegate & datasource as it\'s being setup? Just looking at one I\'m working on now I see that numberOfSectionsI[详细]

2022-12-14 17:39 分类：问答
What exactly is a so called "Class Cluster" in Objective-C?

I was reading 开发者_如何学编程that NSArray is just such a thing. Sounds heavy. I have 7 really fat books here on my desk about Objective-C, Cocoa and C. None of them mention Class Cluster at all, at[详细]

2022-12-13 01:03 分类：问答
What are Delegate and Delegate Methods

What are the differences between Delegate & Delegate Methods开发者_运维百科 and what are their uses?It\'s hard to explain, but a delegate performs methods on behalf of another object. A Table View[详细]

2022-12-12 21:27 分类：问答
combining flipsideview and navigationview

when i am trying to combine flipsideview and navigation view i am getting following error \"request for member \'delegate\' is something not in a structure or union\" on the line controller.delegate =[详细]

2022-12-12 05:40 分类：问答