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//
// UIImage+Fit.m
// redstar
//
// Created by admin on 15/12/28.
// Copyright © 2015年 ZWF. All rights reserved.
//
#import "UIImage+Fit.h"
@implementation UIImage (Fit)
//计算适合的大小。并保留其原始图片大小
+ (CGSize) fitSize: (CGSize)thisSize inSize: (CGSize) aSize
{
CGFloat scale;
CGSize newsize = thisSize;
if (newsize.height && (newsize.height > aSize.height))
{
scale = aSize.height / newsize.height;
newsize.width *= scale;
newsize.height *= scale;
}
if (newsize.width && (newsize.width >= aSize.width))
{
scale = aSize.width / newsize.width;
newsize.width *= scale;
newsize.height *= scale;
}
return newsize;
}
// 返回调整的缩略图
+ (UIImage *) image: (UIImage *) image fitInSize: (CGSize) viewsize
{
// calculate the fitted size
CGSize size = [self fitSize:image.size inSize:viewsize];
UIGraphicsBeginImageContext(viewsize);
float dwidth = (viewsize.width - size.width) / 2.0f;
float dheight = (viewsize.height - size.height) / 2.0f;
CGRect rect = CGRectMake(dwidth, dheight, size.width, size.height);
[image drawInRect:rect];
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newimg;
}
//返回居中的缩略图
+ (UIImage *) image: (UIImage *) image centerInSize: (CGSize) viewsize {
CGSize size = image.size;
UIGraphicsBeginImageContext(viewsize);
float dwidth = (viewsize.width - size.width) / 2.0f;
float dheight = (viewsize.height - size.height) / 2.0f;
CGRect rect = CGRectMake(dwidth, dheight, size.width, size.height);
[image drawInRect:rect];
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newimg;
}
// 返回填充的缩略图
+ (UIImage *) image: (UIImage *) image fillSize: (CGSize) viewsize {
CGSize size = image.size;
CGFloat scalex = viewsize.width / size.width;
CGFloat scaley = viewsize.height / size.height;
CGFloat scale = MAX(scalex, scaley);
UIGraphicsBeginImageContext(viewsize);
CGFloat width = size.width * scale;
CGFloat height = size.height * scale;
float dwidth = ((viewsize.width - width) / 2.0f);
float dheight = ((viewsize.height - height) / 2.0f);
CGRect rect = CGRectMake(dwidth, dheight, size.width * scale, size.height * scale);
[image drawInRect:rect];
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newimg;
}
@end