锚点 对应的位置
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switch (anchorPoint) {case AnchorPointTopLeft:point = CGPointMake(0, 0);break;点击打开链接http://blog.csdn.net/a21064346/article/details/8455821case AnchorPointTopCenter:point = CGPointMake(0.5, 0);break;case AnchorPointTopRight:point = CGPointMake(1, 0);break;case AnchorPointMiddleLeft:point = CGPointMake(0, 0.5);break;case AnchorPointCenter:point = CGPointMake(0.5, 0.5);break;case AnchorPointMiddleRight:point = CGPointMake(1, 0.5);break;case AnchorPointBottomLeft:point = CGPointMake(0, 1);break;case AnchorPointBottomCenter:point = CGPointMake(0.5, 1);break;case AnchorPointBottomRight:point = CGPointMake(1, 1);break;default:break;
