autolayout - use code init UITextView, Constraints not working -

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use code init uitextview, constraints retuen nsarray count 0

- (void)textviewdidchange:(uitextview *)textview{ nslog(@"constraints:%@",textview.constraints);}  2016-08-08 17:43:32.347 demo[5756:2552780] constraints:()

but use storyboard init ok.


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