objective-c-blocks

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Recursive call within a block completion in animateWithDuration?

I have a set of animations that need to operate sequentially w开发者_如何学运维ith various checking done at each step.Because the size of the set is determined at run time, I expected to utilize a rec[详细]

2023-03-04 10:30 分类：问答
using completion with animateWithDuration causes exc_bad_access

I am trying to animate 2 UIButtons in a UITableViewCell called addToPlaylist and removeFromPlayList (they animate off to the right after being swiped on) and am using a block as follows[详细]

2023-03-04 04:01 分类：问答
Having trouble with BOOL return type in Objective-C blocks

I stumbled over a curious problem with BOOL return type in blocks. Having the following definition: typedef BOOL (^BoolBlock)(void);[详细]

2023-03-03 17:13 分类：问答
Which is the right one, nil or NULL, to mark "no Objective-C block"?

If I want to pass nothing for an Objective-C block, what keyword should I use, NULL or nil? I\'m asking this because an Objective-C block is an Objective-C object (as I know), but represented as a fun[详细]

2023-02-28 20:30 分类：问答
In objective-c, is there some way to check a variable hasn't been released by the time a lambda is called?

In objective-c, is there some way to check a variable hasn\'t been released by the time a lambda is called?[详细]

2023-02-28 18:45 分类：问答
Can I call [self retain] within -dealloc? Or, how do I ensure dealloc happens on the main thread?

Here is my situation. It\'s complicated so bear with me. I have a view class, let\'s call it MyView. It creates a loading indicator subview, and then starts a background operation that will load data[详细]

2023-02-28 14:43 分类：问答
How to "optionalize" block-based UIView animations?

My custom control has a method -setValue:animated:, which takes an animated flag. Before iOS 4, I would have written the animation thus:[详细]

2023-02-26 03:53 分类：问答
When making unit tests for objective C, how do you test blocks?

I have a function (internally uses ASIHTTPRequest) which calls a block with the result: [Http get:@\"http://api.geonames.org/postalCodeLookupJSON\"[详细]

2023-02-24 23:48 分类：问答
Why does std::tr1::function work with Objective-C Blocks?

I was pretty surprised when I found that the following code actually works: std::vecto开发者_如何学Gor<int> list /*= ...*/;[详细]

2023-02-23 01:20 分类：问答
EXC_BAD_ACCESS with using dispatch_async

I\'m attempting to execute a block via an asynchronous dispatch queue in Objective-C++.Here\'s a class fragment of what I\'m trying to do...[详细]

2023-02-22 20:20 分类：问答