那里。如何从另一个 ViewController 更改 CGImageRef?
我有这个代码:
#import "ScratchableView.h"
@implementation ScratchableView
- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
      //init with the scratchable gray image
           scratchable = [UIImage imageNamed:@"image.jpg"].CGImage;
            width = CGImageGetWidth(scratchable);
    height = CGImageGetHeight(scratchable);
    self.opaque = NO;
    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
    CFMutableDataRef pixels = CFDataCreateMutable( NULL , width * height );
    alphaPixels = CGBitmapContextCreate( CFDataGetMutableBytePtr( pixels ) , width , height , 8 , width , colorspace , kCGImageAlphaNone );
    provider = CGDataProviderCreateWithCFData(pixels);
    CGContextSetFillColorWithColor(alphaPixels, [UIColor blackColor].CGColor);
    CGContextFillRect(alphaPixels, frame);
    CGContextSetStrokeColorWithColor(alphaPixels, [UIColor whiteColor].CGColor);
    CGContextSetLineWidth(alphaPixels, 30.0);
    CGContextSetLineCap(alphaPixels, kCGLineCapSquare);
    CGImageRef mask = CGImageMaskCreate(width, height, 8, 8, width, provider, nil, NO);
    scratched = CGImageCreateWithMask(scratchable, mask);
    CGImageRelease(mask);
    CGColorSpaceRelease(colorspace);
    }
    return self;
}
现在从另一个视图控制器我想用 image2.jpg 更改 image.jpg。请帮帮我,我该怎么做?
我尝试使用应用程序委托,使用 nsstrings,但没有成功。我是初学者。