iOS:autolayout,多个label如何设置居中显示?
刚学autolayout,关于这个问题,一直没搞清楚！
疑惑一:多个view(label)如何设置居中显示?
backview addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[lab_before[lab_after]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(lab_before,lab_middle,lab_after)]];
枚举类型参数中:
typedef NS_OPTIONS(NSUInteger, NSLayoutFormatOptions) {
NSLayoutFormatAlignAllLeft = (1 << NSLayoutAttributeLeft),
NSLayoutFormatAlignAllRight = (1 << NSLayoutAttributeRight),
NSLayoutFormatAlignAllTop = (1 << NSLayoutAttributeTop),
NSLayoutFormatAlignAllBottom = (1 << NSLayoutAttributeBottom),
NSLayoutFormatAlignAllLeading = (1 << NSLayoutAttributeLeading),
NSLayoutFormatAlignAllTrailing = (1 << NSLayoutAttributeTrailing),
NSLayoutFormatAlignAllCenterX = (1 << NSLayoutAttributeCenterX),
NSLayoutFormatAlignAllCenterY = (1 << NSLayoutAttributeCenterY),
NSLayoutFormatAlignAllBaseline = (1 << NSLayoutAttributeBaseline),
NSLayoutFormatAlignAllLastBaseline = NSLayoutFormatAlignAllBaseline,
NSLayoutFormatAlignAllFirstBaseline NS_ENUM_AVAILABLE_IOS(8_0) = (1 << NSLayoutAttributeFirstBaseline),
NSLayoutFormatAlignmentMask = 0xFFFF,
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层次结构是:
- view -backview -label1 -label2 -label3 // 设置水平布局 [backview addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[lab_before]-[lab_middle]-[lab_after]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(lab_before,lab_middle,lab_after)]]; // 设置backview宽度 [view addConstraint:[NSLayoutConstraint constraintWithItem:backview attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:dynaContentView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:before_width+middle_width+after_width]]; // 设置backview居中显示 [view addConstraint:[NSLayoutConstraint constraintWithItem:backview attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:dynaContentView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0]]; // 设置backview的高度 [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[backview(=2019-07-17 20:00:54赞同 展开评论 打赏
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