使用transform属性对UIView进行扩大,缩放,旋转,平移,反转等效果
缩放:CGAffineTransformMakeRotation(90.0*(M_PI/180));
扩大和缩放:CGAffineTransformMakeScale(2.0,0.5);
左右反转:CGAffineTransformScale(-1.0,1.0)
上下反转:CGAffineTransformScale(1.0,-1.0);
平移:CGAffineTranksformMakeTrankslation(25.0,-50);
两个变形复合:CGAffineTranksformContact(CGAffineTransform,CGAffineTransform);