动态布局
1.设置约束的active属性
self.labelCenterYNormalCons.active = NO;
self.labelCenterYKeyboardCons.active = YES;
2.第二种方法 设置priority 默认的750 250 1000
self.highlight.priority = UILayoutPriorityDefaultLow;
self.normal.priority = UILayoutPriorityDefaultHigh;
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