_messageBtn=[[UIButtonalloc]initWithFrame:CGRectMake(0,0,160,40)];_messageBtn.center=CGPointMake([UIScreenMainscreen].bounds.size.width/2.,350+3);[_messageBtnsetTitle:@"同意服务协议和支付协议"forState:UIControlStateNormal];[self.viewaddSubview:_messageBtn];我还有一个UILabel,我想用AutoLayout让这个label在_messageBtn左边间隔10的距离,要怎么约束呢?
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