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最新推荐文章于 2024-07-31 11:08:23 发布

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最新推荐文章于 2024-07-31 11:08:23 发布

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原文链接：http://www.cnblogs.com/xuanzhangran123/p/5153890.html

主控制器的关键代码：

ZRViewController.m

#import "ZRViewController.h"
#import "UIImage+ZR.h"

@interface ZRViewController ()
- (IBAction)clip;
@property (weak, nonatomic) IBOutlet UIView *whiteView;

@end

@implementation ZRViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)clip {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        // 1.捕捉
        UIImage *newImage = [UIImage captureWithView:self.view];
        
        // 2.写文件
        NSData *data = UIImagePNGRepresentation(newImage);
        NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"new.png"];
        [data writeToFile:path atomically:YES];
    });
}
@end

创建分类UIImage分类文件：

UIImage+ZR.h

#import <UIKit/UIKit.h>

@interface UIImage (ZR)
+ (instancetype)captureWithView:(UIView *)view;
@end

UIImage+ZR.m

#import "UIImage+ZR.h"

@implementation UIImage (ZR)
+ (instancetype)captureWithView:(UIView *)view
{
    // 1.开启上下文
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);
    
    // 2.将控制器view的layer渲染到上下文
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    // 3.取出图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    // 4.结束上下文
    UIGraphicsEndImageContext();
    
    return newImage;
}
@end