首先寫一個(gè)UIImage的分類

#import "UIImage+Extension.h"

@implementation UIImage (Extension)


+ (UIImage *)rendImageWithView:(UIView *)view{
    
//      1.開始位圖上下文
    UIGraphicsBeginImageContext(view.frame.size);
//      2.獲取上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
//    3.截圖
    [view.layer renderInContext:ctx];
//    4.獲取圖片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
//    5.關(guān)閉上下文
    UIGraphicsEndImageContext() ;
    
    return newImage;
    
}
@end

在需要截圖的view里調(diào)用此方法

//    1.獲取一個(gè)截圖圖片
    UIImage *newImage = [ UIImage rendImageWithView:self.view];
//    2.寫入相冊
    UIImageWriteToSavedPhotosAlbum(newImage, self, @selector(image:didFinishSavingWithError:contextInfo:), @"134");

#pragma mark 用來監(jiān)聽圖片保存到相冊的狀況

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        [MBProgressHUD showError:@"保存失敗"];
    }else{
        [MBProgressHUD showSuccess:@"保存成功"];
    
    }
    
    NSLog(@"%@",contextInfo);
    
}