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https://github.com/yulingtianxia/blocktracker

Tracking block args of Objective-C method based on BlockHook
https://github.com/yulingtianxia/blocktracker

blockhook blocktracker carthage cocoapods hookblock

Last synced: about 2 months ago
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Tracking block args of Objective-C method based on BlockHook

Host: GitHub
URL: https://github.com/yulingtianxia/blocktracker
Owner: yulingtianxia
License: mit
Created: 2018-03-27T07:04:08.000Z (almost 7 years ago)
Default Branch: master
Last Pushed: 2022-01-16T12:42:04.000Z (almost 3 years ago)
Last Synced: 2024-11-01T18:51:35.588Z (about 2 months ago)
Topics: blockhook, blocktracker, carthage, cocoapods, hookblock
Language: Objective-C
Homepage: http://yulingtianxia.com/blog/2018/03/31/Track-Block-Arguments-of-Objective-C-Method/
Size: 738 KB
Stars: 78
Watchers: 6
Forks: 10
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE

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# BlockTracker

BlockTracker can track block arguments of a method. It's based on [BlockHook](https://github.com/yulingtianxia/BlockHook).

## 📚 Article

[追踪 Objective-C 方法中的 Block 参数对象](http://yulingtianxia.com/blog/2018/03/31/Track-Block-Arguments-of-Objective-C-Method/)

## 🌟 Features

- [x] Easy to use.

- [x] Keep your code clear.

- [x] Let you modify return value and arguments.

- [x] Trace all block args of method.

- [x] Trace all `NSMallocBlock`.

- [x] Self-managed trackers.

- [x] Support CocoaPods & Carthage.

## 🔮 Example

The sample project "BlockTrackerSample" just only support iOS platform.

## 🐒 How to use

### Track blocks in method

You can track blocks in arguments. This method returns a `BTTracker` instance for more control. You can `stop` a `BTTracker` when you don't want to track it anymore.

```objc

__unused BTTracker *tracker = [self bt_trackBlockArgOfSelector:@selector(performBlock:) callback:^(BHInvocation * _Nonnull invocation) {

    switch (invocation.mode) {

        case BlockHookModeBefore:

            NSLog(@"Before block:%@, mangleName:%@", invocation.token.block, invocation.token.mangleName);

            break;

        case BlockHookModeAfter:

            NSLog(@"After block:%@, mangleName:%@", invocation.token.block, invocation.token.mangleName);

            objc_setAssociatedObject(invocation.token, @"invoked", @YES, OBJC_ASSOCIATION_RETAIN);

            break;

        case BlockHookModeDead:

            NSLog(@"Block Dead! mangleName:%@", invocation.token.mangleName);

            BOOL invoked = [objc_getAssociatedObject(invocation.token, @"invoked") boolValue];

            if (!invoked) {

                NSLog(@"Block Not Invoked Before Dead! %@", invocation.token.mangleName);

            }

            break;

        default:

            break;

    }

}];

    

// invoke blocks

NSString *word = @"I'm a block";

[self performBlock:^{

    NSLog(@"%@", word);

}];

// stop tracker in future

//    [tracker stop];

// blocks will die

- (void)performBlock:(void(^)(void))block {

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), block);

}

@end

```

Here is the log:

```

Hook Block Arg mangleName:__42-[BlockTrackerSampleTests testTrackMethod]_block_invoke_2, in selector:performBlock:

Before block:<__NSMallocBlock__: 0x600000c71aa0>, mangleName:__42-[BlockTrackerSampleTests testTrackMethod]_block_invoke_2

I'm a block

After block:<__NSMallocBlock__: 0x600000c71aa0>, mangleName:__42-[BlockTrackerSampleTests testTrackMethod]_block_invoke_2

Block Dead! mangleName:__42-[BlockTrackerSampleTests testTrackMethod]_block_invoke_2

```

### Track a batch of blocks.

```objc

setMallocBlockCallback(^(BHInvocation * _Nonnull invocation) {

    switch (invocation.mode) {

        case BlockHookModeBefore: {

            NSLog(@"Before block:%@, mangleName:%@", invocation.token.block, invocation.token.mangleName);

            break;

        }

        case BlockHookModeAfter: {

            NSLog(@"After block:%@, mangleName:%@", invocation.token.block, invocation.token.mangleName);

            objc_setAssociatedObject(invocation.token, @"invoked", @YES, OBJC_ASSOCIATION_RETAIN);

            break;

        }

        case BlockHookModeDead: {

            NSLog(@"Block Dead! mangleName:%@", invocation.token.mangleName);

            BOOL invoked = [objc_getAssociatedObject(invocation.token, @"invoked") boolValue];

            if (!invoked) {

                NSLog(@"Block Not Invoked Before Dead! %@", invocation.token.mangleName);

            }

            break;

        }

        default:

            break;

    }

});

```

## 📲 Installation

### CocoaPods

[CocoaPods](http://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:

```bash

$ gem install cocoapods

```

To integrate BlockTracker into your Xcode project using CocoaPods, specify it in your `Podfile`:

```

source 'https://github.com/CocoaPods/Specs.git'

platform :ios, '8.0'

use_frameworks!

target 'MyApp' do

	pod 'BlockTracker'

end

```

You need replace "MyApp" with your project's name.

Then, run the following command:

```bash

$ pod install

```

### Carthage

[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with [Homebrew](http://brew.sh/) using the following command:

```bash

$ brew update

$ brew install carthage

```

To integrate BlockTracker into your Xcode project using Carthage, specify it in your `Cartfile`:

```ogdl

github "yulingtianxia/BlockTracker"

```

Run `carthage update` to build the framework and drag the built `BlockTrackerKit.framework` into your Xcode project.

### Manual

Just drag source files in `BlockTracker` folder to your project.

## ❤️ Contributed

- If you **need help** or you'd like to **ask a general question**, open an issue.

- If you **found a bug**, open an issue.

- If you **have a feature request**, open an issue.

- If you **want to contribute**, submit a pull request.

## 👨🏻‍💻 Author

yulingtianxia, [email protected]

## 👮🏻 License

BlockTracker is available under the MIT license. See the LICENSE file for more info.