1.寬度不夠時(shí)
[_label1setContentCompressionResistancePriority:UILayoutPriorityRequiredforAxis:UILayoutConstraintAxisHorizontal];
2.寬度夠時(shí)
[labelsetContentHuggingPriority:UILayoutPriorityRequiredforAxis:UILayoutConstraintAxisHorizontal];
1.寬度不夠時(shí)
[_label1setContentCompressionResistancePriority:UILayoutPriorityRequiredforAxis:UILayoutConstraintAxisHorizontal];
2.寬度夠時(shí)
[labelsetContentHuggingPriority:UILayoutPriorityRequiredforAxis:UILayoutConstraintAxisHorizontal];