jixin_new/shiku_im/util/UIView+ScreenShot.m

//
//  UIView+ScreenShot.m
//  shiku_im
//
//  Created by Apple on 16/12/7.
//  Copyright © 2016年 Reese. All rights reserved.
//

#import "UIView+ScreenShot.h"

@implementation UIView (ScreenShot)

- (UIImage *)screenshot
{
    return [self screenshotWithRect:self.bounds];
}

- (UIImage *)screenshotWithRect:(CGRect)rect;
{
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    if (context == NULL)
    {
        return nil;
    }
    CGContextSaveGState(context);
    CGContextTranslateCTM(context, -rect.origin.x, -rect.origin.y);
    
    //[self layoutIfNeeded];
    
    if( [self respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
    {
        [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
    }
    else
    {
        [self.layer renderInContext:context];
    }
    
    CGContextRestoreGState(context);
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    //    NSData *imageData = UIImageJPEGRepresentation(image, 1); // convert to jpeg
    //    image = [UIImage imageWithData:imageData scale:[UIScreen mainScreen].scale];
    
    return image;
}

- (UIImage *)snapshot:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);
    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

- (UIImage *)viewSnapshot:(UIView *)view withInRect:(CGRect)rect
{
//    UIGraphicsBeginImageContext(view.bounds.size);
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO,[UIScreen mainScreen].scale);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
//    image = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(image.CGImage,rect)];
    return image;
}

+ (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize
{
//    UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize), NO,[UIScreen mainScreen].scale);
    [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
                                
    return scaledImage;
                                
}

@end