在iOS开发的Quartz2D使用中实现图片剪切和截屏功能

二、代码示例

　　storyboard界面搭建

代码：

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//
//  YYViewController.m
//  01-截屏
//
//  Created by apple on 14-6-12.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

 

#import "YYViewController.h"
#import "MBProgressHUD+NJ.h"

@interface YYViewController ()
@property (weak, nonatomic) IBOutlet UIView *contentView;
- (IBAction)BtnClick:(UIButton *)sender;

@end

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@implementation YYViewController

 

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (IBAction)BtnClick:(UIButton *)sender {
    
    //延迟两秒保存
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        //获取图形上下文
        //    UIGraphicsBeginImageContext(self.view.frame.size);
        UIGraphicsBeginImageContext(self.contentView.frame.size);
        //将view绘制到图形上下文中
        
        //    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
        [self.contentView.layer renderInContext:UIGraphicsGetCurrentContext()];
     
        
        //将截屏保存到相册
        UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
        
        UIImageWriteToSavedPhotosAlbum(newImage,self, @selector(image:didFinishSavingWithError:contextInfo:), nil);