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我有一个小应用程序,显示来自远程PC的屏幕。通常为了提高性能,我们只更新正在改变的屏幕部分。该应用程序的作品,但是当屏幕变化很快时,IPAD上的更新速度很慢。看看'dawrect'和DoImage中的代码我看到很多代码重复,有没有什么办法可以优化它?代码优化
THX
- (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];
}
荫不知道这一点,但你可以尝试更换[自doUpdateWithImage:aImage]。在图像= aImage的DoImage中; – visakh7 2011-04-11 10:35:42
Thx Bavarious,我会测试,但似乎没有调用drawrect。 – user701934 2011-04-11 11:16:19