iOS——抢鲜来体验一下FBMemoryProfiler

FBMemoryProfiler简介

  1. 4月刚刚推出的新品~保证中你口味
  2. FaceBook荣誉出品~
  3. 作者Gricha
  4. 功能及前身:也许你用过FBRetainCycleDetector,这就是FBMemoryProfiler的前身了,是由Gricha编写用来检测循环引用的小工具。FBMemoryProfiler比FBRetainCycleDetector要强大的多,提供了非常帮的交互界面和更多的功能。

FBMemoryProfiler一览

初上手

  1. pod安装

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    pod 'FBMemoryProfiler'
  1. enable FBAllocationTracker:

    mian.m文件中(注意是main.m,不是AppDelegate.m)中加入:

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    #import <FBAllocationTracker/FBAllocationTrackerManager.h>

    int main(int argc, char * argv[]) {
    [[FBAllocationTrackerManager sharedManager] startTrackingAllocations];
    [[FBAllocationTrackerManager sharedManager] enableGenerations];
    @autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
    }
  1. enable FBMemoryProfiler:

    这次是去AppDelegate.m了,去加一个变量,保证MemoryProfiler不会被释放:

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    @property (nonatomic , strong) FBMemoryProfiler * memoryProfiler;
在`didFinishLaunchingWithOptions`方法中添加:

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self.memoryProfiler = [FBMemoryProfiler new];
retainCycleDetectorConfiguration:nil];
[self.memoryProfiler enable];
  1. 试一试,运行你的APP是不是能看到小方块了

    初始样式
    展开

  2. 展开后点击Expand,可以看到所有的类,你可以通过Filter过滤你想看到的结果,比如你的项目是CF开头,就可以输入CF来过滤

  3. 还有很多功能,去尝试吧!

添加自己的pulgin

除了基本功能,FBMemoryProfiler还提供了接口扩展功能

1. FBMemoryProfilerPluggable

你可以阅读FBMemoryProfilerPluggable.h
FBMemoryProfilerPluggable是一个协议,你可以通过实现这个协议来扩展你想要的功能
提供了如下方法:

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@protocol FBMemoryProfilerPluggable <NSObject>

@optional

/**
Lifecycle events, when Memory profiler is enabled/disabled
*/
- (void)memoryProfilerDidEnable;
- (void)memoryProfilerDidDisable;

/**
When memory profiler finds retain cycles plugins can subscribe to get them.
*/
- (void)memoryProfilerDidFindRetainCycles:(nonnull NSSet *)retainCycles;

/**
If you want to do additional cleanup after marking new generations.
*/
- (void)memoryProfilerDidMarkNewGeneration;

@end

2. 实现FBMemoryProfilerPluggable协议

来看看Example中提供简单的插件

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/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the license found in the LICENSE file in
* the root directory of this source tree.
*/

#import <Foundation/Foundation.h>

#import <FBMemoryProfiler/FBMemoryProfiler.h>

/**
Example of FBMemoryProfiler plugin that will NSLog all retain cycles found
within FBMemoryProfiler. This could, for instance, send it somewhere to the backend.
*/

@interface RetainCycleLoggerPlugin : NSObject <FBMemoryProfilerPluggable>

@end
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/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the license found in the LICENSE file in
* the root directory of this source tree.
*/
#import "RetainCycleLoggerPlugin.h"

@implementation RetainCycleLoggerPlugin

- (void)memoryProfilerDidFindRetainCycles:(NSSet *)retainCycles
{
if (retainCycles.count) {
DDLogWarn(@"%@", retainCycles);
}
}
@end

其功能就是简单的打印(DDLogWarn是CocoaLumberjack提供的Log方法你可以换成你自己的)

3. 修改FBMemoryProfiler的初始化方法

写好插件后需要用起来,去改一下AppDelegate中的FBMemoryProfiler初始化方法即可

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self.memoryProfiler = [[FBMemoryProfiler alloc] initWithPlugins:@[[CacheCleanerPlugin new],
[RetainCycleLoggerPlugin new]] retainCycleDetectorConfiguration:nil];
[self.memoryProfiler enable];

重新运行项目,点击Retain Cycles按钮,是不是能看到控制台有打印了

补充

FBMemoryProfiler目前只是0.1版本,不能算稳定,我在使用的时候也Crash了好几次。但是谁不相信FaceBook的大神呢~嘿嘿


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