[翻译] LLSimpleCamera

LLSimpleCamera A simple customizable camera control

LLSimpleCamera is a library for creating a customized camera screens similar to snapchat's. You don't have to present the camera in a new view controller.

LLSimpleCamera是一个开源库，帮助你创建自定义的照相机，类似于应用snapchat那样子的效果。你不需要重新在新控制器中创建出照相机。

LLSimpleCamera:

• lets you easily capture photos 能让你非常容易的截取图片
• handles the position and flash of the camera 能控制照相机的位置以及照相机闪光灯
• hides the nitty gritty details from the developer 隐藏各种恶心的代码细节
• don't have to be presented in a new modal view controller, simply can be embedded any of your VCs. (like Snapchat) 可以快速的嵌入到你的控制器当中

Version 1.1.1

• fixed a potential crash scenario if -stop() is called multiple times 修复了一个重复调用-stop()导致崩溃的问题

Version 1.1.0

• fixed a problem that sometimes caused a crash after capturing a photo. 修复了有时候获取图片时崩溃的问题
• improved code structure, didChangeDevice delegate is now also triggered for the first default device.  改进代码结构，didChangeDevice代理方法如今已经可以控制第一个默认的设备了

Install

pod 'LLSimpleCamera', '~> 1.1'

Example usage - 如何使用

CGRect screenRect = [[UIScreen mainScreen] bounds];

// create camera vc
self.camera = [[LLSimpleCamera alloc] initWithQuality:CameraQualityPhoto];

// attach to the view and assign a delegate
[self.camera attachToViewController:self withDelegate:self];

// set the camera view frame to size and origin required for your app
self.camera.view.frame = CGRectMake(0, 0, screenRect.size.width, screenRect.size.height);

and here are the example delegates:

这是代理的使用方式：

/* camera delegates */
- (void)cameraViewController:(LLSimpleCamera *)cameraVC didCaptureImage:(UIImage *)image {

    // we should stop the camera, since we don't need it anymore. We will open a new vc.
    [self.camera stop];

    ImageViewController *imageVC = [[ImageViewController alloc] initWithImage:image];
    [self presentViewController:imageVC animated:NO completion:nil];
}

- (void)cameraViewController:(LLSimpleCamera *)cameraVC didChangeDevice:(AVCaptureDevice *)device {

    // device changed, check if flash is available
    if(cameraVC.isFlashAvailable) {
        self.flashButton.hidden = NO;
    }
    else {
        self.flashButton.hidden = YES;
    }

    self.flashButton.selected = NO;
}

Adding the camera controls - 添加照相机控制

You have to add your own camera controls (flash, camera switch etc). Simply add the controls to the view that the camera is attached to. You can see a full camera example in the example project. Download and try it on your device.

你需要添加你自己的照相机控制（闪光灯，照相机等等诸如此类的）。你只需要简单的将控制相关的控件添加上去就可以，你可以在示例代码中看一下就知道了。

Stopping and restarting the camera

You should never forget to stop the camera either after the didCaptureImage delegate is triggered, or inside somewhere -viewWillDisappear of the parent controller to make sure your app doesn't try to use the camera when it is not needed. You can call -start() again to use the camera. So it may be good idea to to place -start() inside -viewWillAppear or some other method where you think it's good to start using the camera input.

你永远都不应该忘记不用的时候要调用didCaptureImage，或者在其他地方调用-viewWillDisappear。你可以在需要用的时候重新执行-start()，所以，比较便利的方法，就是你将-start()方法放到-viewWillAppear，或者其他的方法当中，你觉得方便就行。