图片拉伸 iOS

创建category文件

.h

#import <UIKit/UIKit.h> @interface UIImage (ImageScale) -(UIImage *)imageScaleSize:(CGSize)size; @end

.m

#import "UIImage+ImageScale.h" @implementation UIImage (ImageScale) -(UIImage *)imageScaleSize:(CGSize)size{     UIGraphicsBeginImageContext(size);     [self drawInRect:CGRectMake(0, 0, size.width, size.height)];     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();          UIGraphicsEndImageContext();     return image; } @end

在ViewController中

@implementation ViewController - (void)viewDidLoad {     [super viewDidLoad];          [self imageScale];      } -(void)imageScale{     UIImage *image =[UIImage imageNamed:@"1"];     UIImage *imageNew =[image imageScaleSize:CGSizeMake(200, 500)];     UIImageWriteToSavedPhotosAlbum(imageNew, nil, nil, nil); // 将图片保存到手机相册中 }

添加 <key>NSPhotoLibraryUsageDescription</key> <string>App需要您的同意,才能访问相册</string>  iOS 10如果访问必须添加否则闪退