iPhone / iPad-如何在CALayer中绘制CGRect图像视图? [英]iphone/ipad - How can I draw an CGRect imageview in CALayer?
iPhone,如何从一系列价格和日期中绘制一个简单的折线图? [英]iPhone, how do I draw a simple line graph from an array of prices and dates?
如何通过一条线或一条线画一条线,该线总是相同的长度(iPhone app dev) [英]How can I draw a line through a point or to a point, where the line is always the same length (iPhone app dev)