objective-c-2.0

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Problem with core data lazy loading

Core Data loads objects lazily, and it is supposed to bring in any objects as soon as you try to reference them.However I have encountered a couple of problems with this scheme.[详细]

2023-02-09 16:37 分类：问答
iPhone App replace images

I got a little problem. I use some images in my app. Today I wanted to replace them with new 开发者_Python百科ones. But when I build and run the project I still get the old ones. I tried to touch the[详细]

2023-01-18 03:02 分类：问答
Problem with Function to convert UNIX TimeStamp

I get those two errors: - Can not use an object as parameter to a method - Incompatible types in return[详细]

2023-01-04 16:29 分类：问答
Setting shadowColor with property syntax gives compiler error: Expected identifier before '[' token

I have an iPad app in which I\'m setting the shadow color of a UILabel in a UIView\'s initWithFrame: method. When I use the following syntax:[详细]

2022-12-28 21:59 分类：问答
Error "Create a concrete instance!"

I\'ve got another problem in the same code... I\'m getting this error: initialization method -initWithCharactersNoCopy:length:freeWhenDone: cannot be sent to an abstract object of class NSString_Reg[详细]

2022-12-25 06:18 分类：问答
Does Objective-C support Mixin like Ruby?

In Ruby, there\'s Modules a开发者_如何学Pythonnd you can extend a class by \"mixing-in\" the module.[详细]

2022-12-24 09:12 分类：问答
objective-c 2.0 properties and 'retain'

Stupid question, but why do we need to use \'retain\' when declaring a property?Doesn\'t it get retained anyway when it\'s assigned something?[详细]

2022-12-22 13:24 分类：问答
UIApplication sharedAppication error: program seems to be accessing wrong file

in my MainViewController implementation, I need to access variables from two different classes. one of the classes is the AppDelegate and the other is the FlipsideViewController.[详细]

2022-12-17 01:18 分类：问答
Reloading Data in a UITableView when pressing a UITabBarItem

I have a UITabBarController as part of my app开发者_高级运维 delegate and I want to trap when the user touches a specific tab (the favourites) and force the table within it to reload the data.[详细]

2022-12-13 18:59 分类：问答