封装的截取高清图的demo~

最新推荐文章于 2021-06-04 00:21:08 发布

原创最新推荐文章于 2021-06-04 00:21:08 发布 · 425 阅读

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本文介绍了一种在iOS应用中实现视图截图的方法，并提供了一种高效的图片压缩方案，适用于需要快速分享或上传图片的应用场景。

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.h 文件

//
//  ShareMethods.h
//  XiaoQiao
//
//  Created by 王小胜 on 17/3/24.
//  Copyright © 2017年 NingboXiaojiang. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface ShareMethods : NSObject

//高还原截图
+ (UIImage *)saveImageOfView:(UIView *)view;

//图片压缩到指定大小
+ (UIImage *)imageByScalingAndCroppingForSize:(CGSize)targetSize SourceImage:(UIImage *)image;
@end

.m 文件

//
//  ShareMethods.m
//  XiaoQiao
//
//  Created by 王小胜 on 17/3/24.
//  Copyright © 2017年 NingboXiaojiang. All rights reserved.
//

#import "ShareMethods.h"
#import <UIKit/UIKit.h>

@implementation ShareMethods


+ (UIImage *)saveImageOfView:(UIView *)view {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *copyImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return copyImage;
}

+ (UIImage *)imageByScalingAndCroppingForSize:(CGSize)targetSize SourceImage:(UIImage *)image{
    UIImage *sourceImage = image;
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;
    CGFloat targetWidth = targetSize.width;
    CGFloat targetHeight = targetSize.height;
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
    
    if (CGSizeEqualToSize(imageSize, targetSize) == NO) {
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        if (widthFactor > heightFactor) {
            scaleFactor = widthFactor; // scale to fit height
        }else{
            scaleFactor = heightFactor;// scale to fit width
        }
        scaledWidth= width * scaleFactor;
        scaledHeight = height * scaleFactor;
        
        // center the image
        if (widthFactor > heightFactor)
        {
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
        }
        else if (widthFactor < heightFactor)
        {
            thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
    }
    UIGraphicsBeginImageContext(targetSize); // this will crop
    
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width= scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    
    [sourceImage drawInRect:thumbnailRect];
    
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    if(newImage == nil)
        NSLog(@"could not scale image");
    
    //pop the context to get back to the default
    UIGraphicsEndImageContext();
    return newImage;
}

@end

使用方法:

1.将文件拖入项目

2.使用的位置引入头文件

3.实例出来shareMethods 调用方法即可