Block didn’t capture self in typeof,why?How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?How do I avoid capturing self in blocks when implementing an API?Disappearing reference to self in a block under ARCPossible to pass [self anyFunction] in blocks without __weak object (iOS 5 + ARC)Generic typeof for weak self referencesobj-c weak self in a block: why the 2nd one doesn't need a weak self inside in two similar casesAFNetworking, UITableView and BlocksDoes declaring strongSelf from weakSelf before a block cause retain cycleDo methods called from within a block need to use weakSelf?Do we need to use weak self in blocks in Objective-C?
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Block didn’t capture self in typeof,why?
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?How do I avoid capturing self in blocks when implementing an API?Disappearing reference to self in a block under ARCPossible to pass [self anyFunction] in blocks without __weak object (iOS 5 + ARC)Generic typeof for weak self referencesobj-c weak self in a block: why the 2nd one doesn't need a weak self inside in two similar casesAFNetworking, UITableView and BlocksDoes declaring strongSelf from weakSelf before a block cause retain cycleDo methods called from within a block need to use weakSelf?Do we need to use weak self in blocks in Objective-C?
For this:
self.block = ^
self.view.backgroundColor = [UIColor greenColor];
;
There is a retain cycle obviously.
However,there is no retain cycle if the self is in the typeof:
__weak typeof(self) weakSelf = self;
self.block = ^
__strong typeof(self) strongSelf = weakSelf;
strongSelf.view.backgroundColor = [UIColor greenColor];
;
The self's dealloc is called even though the self is in the block.That means the block didn't capture self here.
Why?
objective-c objective-c-blocks
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
add a comment |
For this:
self.block = ^
self.view.backgroundColor = [UIColor greenColor];
;
There is a retain cycle obviously.
However,there is no retain cycle if the self is in the typeof:
__weak typeof(self) weakSelf = self;
self.block = ^
__strong typeof(self) strongSelf = weakSelf;
strongSelf.view.backgroundColor = [UIColor greenColor];
;
The self's dealloc is called even though the self is in the block.That means the block didn't capture self here.
Why?
objective-c objective-c-blocks
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
1
Another thing you can also do if you want it to be "less confusing" is do__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.
– Mobile Ben
Mar 7 at 23:30
add a comment |
For this:
self.block = ^
self.view.backgroundColor = [UIColor greenColor];
;
There is a retain cycle obviously.
However,there is no retain cycle if the self is in the typeof:
__weak typeof(self) weakSelf = self;
self.block = ^
__strong typeof(self) strongSelf = weakSelf;
strongSelf.view.backgroundColor = [UIColor greenColor];
;
The self's dealloc is called even though the self is in the block.That means the block didn't capture self here.
Why?
objective-c objective-c-blocks
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
For this:
self.block = ^
self.view.backgroundColor = [UIColor greenColor];
;
There is a retain cycle obviously.
However,there is no retain cycle if the self is in the typeof:
__weak typeof(self) weakSelf = self;
self.block = ^
__strong typeof(self) strongSelf = weakSelf;
strongSelf.view.backgroundColor = [UIColor greenColor];
;
The self's dealloc is called even though the self is in the block.That means the block didn't capture self here.
Why?
objective-c objective-c-blocks
objective-c objective-c-blocks
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
asked Mar 7 at 12:54
无夜之星辰无夜之星辰
8141720
8141720
1
Another thing you can also do if you want it to be "less confusing" is do__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.
– Mobile Ben
Mar 7 at 23:30
add a comment |
1
Another thing you can also do if you want it to be "less confusing" is do__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.
– Mobile Ben
Mar 7 at 23:30
1
1
Another thing you can also do if you want it to be "less confusing" is do
__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.– Mobile Ben
Mar 7 at 23:30
Another thing you can also do if you want it to be "less confusing" is do
__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.– Mobile Ben
Mar 7 at 23:30
add a comment |
1 Answer
1
active
oldest
votes
typeof is not a function, it's a keyword and isn't used at runtime at all. All __strong typeof(self) is doing here is telling the compiler how to evaluate the symbol strongSelf. It doesn't cause any runtime code to be generated, because it doesn't matter at runtime what that type actually is. All those decisions are made at compile-time.
This is the same as defining something as int x; The runtime does not in any way have a reference to "int". It's just a C type.
typeof is technically a C extension, but Clang supports it as a keyword when in a gcc compatibility mode, which is the default. For more on the extension, see the GCC documentation.
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
add a comment |
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typeof is not a function, it's a keyword and isn't used at runtime at all. All __strong typeof(self) is doing here is telling the compiler how to evaluate the symbol strongSelf. It doesn't cause any runtime code to be generated, because it doesn't matter at runtime what that type actually is. All those decisions are made at compile-time.
This is the same as defining something as int x; The runtime does not in any way have a reference to "int". It's just a C type.
typeof is technically a C extension, but Clang supports it as a keyword when in a gcc compatibility mode, which is the default. For more on the extension, see the GCC documentation.
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
add a comment |
typeof is not a function, it's a keyword and isn't used at runtime at all. All __strong typeof(self) is doing here is telling the compiler how to evaluate the symbol strongSelf. It doesn't cause any runtime code to be generated, because it doesn't matter at runtime what that type actually is. All those decisions are made at compile-time.
This is the same as defining something as int x; The runtime does not in any way have a reference to "int". It's just a C type.
typeof is technically a C extension, but Clang supports it as a keyword when in a gcc compatibility mode, which is the default. For more on the extension, see the GCC documentation.
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
add a comment |
typeof is not a function, it's a keyword and isn't used at runtime at all. All __strong typeof(self) is doing here is telling the compiler how to evaluate the symbol strongSelf. It doesn't cause any runtime code to be generated, because it doesn't matter at runtime what that type actually is. All those decisions are made at compile-time.
This is the same as defining something as int x; The runtime does not in any way have a reference to "int". It's just a C type.
typeof is technically a C extension, but Clang supports it as a keyword when in a gcc compatibility mode, which is the default. For more on the extension, see the GCC documentation.
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
typeof is not a function, it's a keyword and isn't used at runtime at all. All __strong typeof(self) is doing here is telling the compiler how to evaluate the symbol strongSelf. It doesn't cause any runtime code to be generated, because it doesn't matter at runtime what that type actually is. All those decisions are made at compile-time.
This is the same as defining something as int x; The runtime does not in any way have a reference to "int". It's just a C type.
typeof is technically a C extension, but Clang supports it as a keyword when in a gcc compatibility mode, which is the default. For more on the extension, see the GCC documentation.
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
edited Mar 7 at 13:26
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
answered Mar 7 at 13:11
Rob NapierRob Napier
206k28303431
206k28303431
add a comment |
add a comment |
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1
Another thing you can also do if you want it to be "less confusing" is do
__strong typeof(weakSelf) strongSelf = weakSelf;. I do this for added clarity.– Mobile Ben
Mar 7 at 23:30