iOS开发技巧——Autolayout动画

使用Autolayout时需要在动画的代码前面后面添加

layoutIfNeeded方法

Animation

AutoLayout也可以配合传统的animation方法，整体代码结构如下。

   1:  [self.view layoutIfNeeded]; 

   2:  [UIView animateWithDuration:0.3f 

   3:                   animations:^{ 

   4:                      //... update constraints    

   5:                     [self.view layoutIfNeeded]; 

   6:                   }]; 

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

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