小编Ale*_*Lee的帖子

我有以下代码：

@implementation MyImageView
@synthesize image; //image is a UIImage
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
    // Initialization code

}
return self;
}
-(void) removeFromSuperview
{
self.image = nil;
[super removeFromSuperview];
}


- (void)drawRect:(CGRect)rect
{
// Drawing code
if (self.image)
{

    CGContextRef context = UIGraphicsGetCurrentContext();


    CGContextClearRect(context, rect);
    //the below 2 lines is to prove that the alpha channel of my UIImage is indeed drawn
    //CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
    //CGContextFillRect(context, rect);
    CGContextDrawImage(context, self.bounds, self.image.CGImage);


}
}
@end

当我运行代码时，我意识到我的视图的背景是黑色的。为了测试我的 UIImage …

我试图在 Ubuntu 服务器 13.0 和 python 2.7 中运行以下 python 代码

from twisted.python.log import err
from twisted.web.client import Agent
from twisted.internet import reactor
from twisted.internet.ssl import ClientContextFactory
from twisted.web.http_headers import Headers
from stringproducer import StringProducer
class WebClientContextFactory(ClientContextFactory):
    def getContext(self, hostname, port):
        return ClientContextFactory.getContext(self)

def display(response):
    print "Received response"
    print response

def main():
    contextFactory = WebClientContextFactory()
    agent = Agent(reactor, contextFactory)


    d = agent.request("POST", "https://myweburl");


    d.addCallbacks(display, err)
    d.addCallback(lambda ignored: reactor.stop())
    reactor.run()

if __name__ == "__main__":
    main()

当我尝试运行它时，它给了我以下错误：

ImportError: No module named twisted.web.client

我曾在 …