代码优化
代码优化
提问于 2011-04-11 18:16:34
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，我们只更新正在更改的屏幕部分。这款应用可以正常工作，但当屏幕快速变化时，IPAD上的更新速度会非常慢。看看'dawrect‘和DoImage中的代码，我发现有很多代码是重复的，有什么方法可以优化它吗？
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];
}回答 1
Stack Overflow用户
发布于 2011-04-11 18:28:04
- (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);
}希望能帮上点忙
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/5619854
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