objective-c-blocks

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Retain cycle possibility with animateWithDuration:

Can I ever run into block retain cycle with animateWithDuration:animations:completion:? If yes, then coul开发者_运维技巧d you please show me some example?[详细]

2023-03-16 03:18 分类：问答
Stack block lifespan

int (^b[3])(); for (int i=0; i<3; i++) b[i] = ^{ return i;}; for (int i=0; i<3; i++) printf(\"b %d\\n\", b[i]());[详细]

2023-03-16 01:58 分类：问答
Is self retained within this Objective-C block?

When I have a block in Objective-C that looks like this: self.request = [[ASIHTTPRequest requestWithURL:...[详细]

2023-03-14 18:05 分类：问答
Blocks for beginWithCompletionHandler from NSOpenPanel

i\'m using beginWithCompletionHandler of NSOpenPanel class. My problem is that projects attribute is an invalid object inside that block. What i\'m missing?[详细]

2023-03-14 17:20 分类：问答
Keep blocks inside a dictionary

I have my own method that takes a block as an a开发者_运维知识库rgument. I want to keep track of that block inside an NSDictionary. What is the best way to add the block to the dictionary?[详细]

2023-03-13 18:33 分类：问答
Objective-C block syntax - can someone explain this?

Can anyone explain how this block syntax works? AStreamBuilder stream_builder = [ [ ^( void ) { // some more code..[详细]

2023-03-13 15:50 分类：问答
blocks in uitableview didSelectRowAtIndexPath and passing autoreleased vars around causing nil behavior

I\'m attempting to download an MP3 file from my server when a user selects a row using blocks and a dispatch_queue. Things seem to work great about 80% of the time.[详细]

2023-03-13 04:24 分类：问答
Obj-C __block variable retain behavior

I\'m encountering a s开发者_开发知识库trange issue when attempting to access a __block (block mutable) variable from outside of a block in which it is modified. This is a very toy example that I\'m us[详细]

2023-03-13 01:55 分类：问答
What is the meaning of the ^ character in the Objective-C code? [duplicate]

This question already has answers here: Caret character between types rather than variables, surrounded by parentheses[详细]

2023-03-11 05:07 分类：问答
Objective C — What is the fastest and most efficient way to enumerate an array?

Edit I read through some articles on blocks and fast enumeration and GCD and the like. @Bbum, who\'s written many articles on the subject of GCD and blocks, says that the block enumeration methods are[详细]

2023-03-09 09:41 分类：问答