[IOS]UIImage+Resize

以下是筆記,這是蠻常用到的功能所以我把他加到Category裡面方便可以重複使用

建立一個新的項目選擇Category ,名稱輸入Resize類別選擇UIImage

UIImage+Resize.h

@interface UIImage (Resize)

+ (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize;

@end

記得是宣告為靜態方法

UIImage+Resize.m

#import "UIImage+Resize.h"

@implementation UIImage (Resize)

+ (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize {

UIGraphicsBeginImageContext( newSize );

[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext(); return newImage; }

@end

使用UIGraphicsBeginImageContext需加入

#import <QuartzCore/QuartzCore.h>

使用方法

UIImage *popimg = [UIImage imageWithImage:[UIImage imageNamed:@"xxx.png"] scaledToSize:CGSizeMake(50, 50)];