Question

我有什么方法可以让用户将图像上传到应用程序中，例如50X150像素的图像，我可以将其分成3个50x50像素的图像吗？

如果是这样，有人可以帮助我选择某些像素并将其分成几个图像吗？

谢谢！

Answer 1

使用此代码...

//在以下方法 inRect：（CGRect）rect ＆gt;＆gt;＆gt;这个rect应该是50x50，或者你可以根据你的要求定义..

- (UIImage *)imageFromImage:(UIImage *)image inRect:(CGRect)rect {

CGImageRef sourceImageRef = [image CGImage];  
CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);  
UIImage *newImage = [UIImage imageWithCGImage:newImageRef scale:1.0 orientation:image.imageOrientation];
CGImageRelease(newImageRef);
return newImage;
}

For more visit this reference..

希望，这会帮助你......享受

Answer 2

在UIImage上定义一个类别，为您提供一个很好的裁剪方法：

- (UIImage *)cropImageInRect:(CGRect)cropRect
{
    CGImageRef image = CGImageCreateWithImageInRect(self.CGImage,cropRect);
    UIImage *croppedImage = [UIImage imageWithCGImage:image];
    CGImageRelease(image);
    return croppedImage;
}

现在使用此类别，您可以轻松地执行您想要的操作：

UIImage *original = ...;
UIImage left = [original cropImageInRect:CGRectMake(0.0, 0.0, 50.0, 50.0)];
UIImage center = [original cropImageInRect:CGRectMake(0.0, 50.0, 50.0, 50.0)];
UIImage right = [original cropImageInRect:CGRectMake(0.0, 100.0, 50.0, 50.0)];

Answer 3

我也需要这个。添加到UIImage上的utils类别方法：

// UIImage+Utls.h

@interface UIImage (UIImage_Utls)

- (UIImage *)subimageInRect:(CGRect)rect;
- (NSArray *)subimagesHorizontally:(NSInteger)count;

@end

// UIImage+Utls.m

#import "UIImage+Utls.h"

@implementation UIImage (UIImage_Utls)

- (UIImage *)subimageInRect:(CGRect)rect {

    CGImageRef imageRef = CGImageCreateWithImageInRect([self CGImage], rect);
    UIImage *answer = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    return answer;
}

- (NSArray *)subimagesHorizontally:(NSInteger)count {

    NSMutableArray *answer = [NSMutableArray arrayWithCapacity:count];
    CGFloat width = self.size.width / count;
    CGRect rect = CGRectMake(0.0, 0.0, width, self.size.height);

    for (int i=0; i<count; i++) {
        [answer addObject:[self subimageInRect:rect]];
        rect = CGRectOffset(rect, width, 0.0);
    }
    return [NSArray arrayWithArray:answer];
}

@end

在xcode中为iPhone应用程序分解图片

3 个答案: