变更记录

方案名称

UIView - 代码实现截图功能

关键字

UIView \ 代码截图 \ 截图 \ 页面图片截取

需求场景

1. 需要在应用内对某个 View 进行截图操作时

参考链接

1. CSDN - IOS开发之—程序截图
2. Stack Overflow - Screenshot in swift iOS?

详细内容

1. 经典 Objective-C 解决方案

//获得View图像
- (UIImage *)imageFromView:(UIView *)theView
{
    UIGraphicsBeginImageContext(theView.frame.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [theView.layer renderInContext:context];
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return theImage;
}

//获得View某个范围内的图像
- (UIImage *)imageFromView:(UIView *)theView atFrame:(CGRect)r
{
    UIGraphicsBeginImageContext(theView.frame.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);
    UIRectClip(r);
    [theView.layer renderInContext:context];
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return  theImage;
}

2. iOS7 + Swift 解决方案

//
//  UIView+Screenshot.swift
//  VideoHouse
//
//  Created by gxw on 14/10/26.
//  Copyright (c) 2014年 b-star. All rights reserved.
//

//实例一
extension UIView {
    func screenshot() -> UIImage {
        var imageFrame = CGRectMake(0, 0, self.frame.size.width, self.frame.height)
        UIGraphicsBeginImageContextWithOptions(imageFrame.size, false, 0)
        self.drawViewHierarchyInRect(imageFrame, afterScreenUpdates: true)
        var screenshot = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return screenshot
    }
}

//实例二
    func screenShotMethod() {
    //Create the UIImage
    UIGraphicsBeginImageContext(view.frame.size)
    view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    //Save it to the camera roll
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}

效果图

（无）

备注

（无）