kmpdfkit_demo/PDFViewer/View/CPDFBackgroundPreview.m

//
//  CPDFBackgroundPreview.m
//  PDFViewer
//
//  Created by kdanmobile_2 on 2023/1/2.
//

#import "CPDFBackgroundPreview.h"
#import "Masonry.h"

@implementation CPDFBackgroundPreview

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    
    if (self) {
        _documentView = [[UIImageView alloc] init];
        [self addSubview:_documentView];
        
        _imageView = [[UIImageView alloc] init];
        [self addSubview:_imageView];
        
        self.backgroundColor = [UIColor systemGray5Color];
    }
    
    return self;
}

- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];
    
    _imageView.layer.borderColor = UIColor.blueColor.CGColor;
    _imageView.layer.borderWidth = 1;
    [_imageView sizeToFit];
    _imageView.contentMode = UIViewContentModeScaleAspectFit;
    
    CGRect frame = _imageView.frame;
    frame.origin = CGPointMake(_documentView.bounds.size.width / 2 - _imageView.frame.size.width / 2, _documentView.bounds.size.height / 2 - _imageView.frame.size.height / 2);
    
    _imageView.frame = frame;
}

@end