w1090485608

将 UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, self.contentsScale); CGContextRef context = UIGraphicsGetCurrentContext(); if (self.opaque) { CGSize size = self.bounds.size; size.width *= self.contentsScale; size.height *= self.contentsScale; CGContextSaveGState(context); { if (!self.backgroundColor || CGColorGetAlpha(self.backgroundColor) < 1) {...