iphone - 代码优化

Question

我有一个小应用程序可以显示来自远程 PC 的屏幕。通常为了提高性能，我们只更新屏幕中发生变化的部分。该应用程序可以运行，但是当屏幕快速变化时，IPAD 上的更新非常慢。查看“dawrect”和 DoImage 中的代码，我看到很多重复的代码，有什么方法可以优化它吗？

谢谢

- (id)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code.
    }
    return self;
}

// Only override drawRect: if you perform custom drawing.
- (void)drawRect:(CGRect)rect {
    CGColorSpaceRef color = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(offscreenPixels,1024,768,8,4*(1024),color,kCGImageAlphaPremultipliedLast);
    UIGraphicsPushContext(context);
    image = CGBitmapContextCreateImage(context);
    UIGraphicsPopContext(); 
    CGContextRelease(context);
    CGColorSpaceRelease(color); 

    CGContextRef c=UIGraphicsGetCurrentContext();
    CGContextDrawImage(c, CGRectMake(0, 0, 1024, 768), image);

    CGImageRelease(image);
}

- (void)dealloc {
    [super dealloc];
}

- (void)DoImage:(CGRect)rect theImage:(UIImage*)aImage {

    CGColorSpaceRef color = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(offscreenPixels,1024,768,8,4*(1024),color,kCGImageAlphaPremultipliedLast);
    UIGraphicsPushContext(context);
    [aImage drawInRect:rect];
    UIGraphicsPopContext();     
    CGContextRelease(context);
    CGColorSpaceRelease(color); 

    // Rfresh screen
    [self setNeedsDisplayInRect:rect];
}

Answer 1

- (void)drawRect:(CGRect)rect {
    [self doUpdateWithImage:image];
    CGContextRef c=UIGraphicsGetCurrentContext();
    CGContextDrawImage(c, CGRectMake(0, 0, 1024, 768), image);

    CGImageRelease(image);
}

- (void)dealloc {
    [super dealloc];
}

- (void)DoImage:(CGRect)rect theImage:(UIImage*)aImage {

    [self doUpdateWithImage:aImage]; 

    // Refresh screen
    [self setNeedsDisplayInRect:rect];
}

- (void)doUpdateWithImage:(UIImage *)image
{
CGColorSpaceRef color = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(offscreenPixels,1024,768,8,4*(1024),color,kCGImageAlphaPremultipliedLast);
    UIGraphicsPushContext(context);
    image = CGBitmapContextCreateImage(context);
    UIGraphicsPopContext(); 
    CGContextRelease(context);
    CGColorSpaceRelease(color); 
}

希望能帮到你