ios – Autolayout约束冲突

概述尝试创建一个超越它的UITextField和UILabel的视图. 以下代码有什么问题？ - (UIView *)tableHeaderView{ NSArray *constraints; UIView *view = [[UIView alloc]initWithFrame:(CGRect){0,0,self.view.frame.size.width, 88}]; 尝试创建一个超越它的UITextFIEld和UILabel的视图.
以下代码有什么问题？

- (UIVIEw *)tableheaderVIEw{    NSArray *constraints;    UIVIEw *vIEw = [[UIVIEw alloc]initWithFrame:(CGRect){0,self.vIEw.frame.size.wIDth,88}];    UITextFIEld *tf = [[UITextFIEld alloc]init];    tf.borderStyle = UITextborderStyleRoundedRect;    tf.text = _filter.name;    [vIEw addSubvIEw:tf];    UILabel *TitleLabel = [[UILabel alloc] init];    TitleLabel.textAlignment = NSTextAlignmentCenter;    TitleLabel.translatesautoresizingMaskIntoConstraints = NO;    TitleLabel.text = [Nsstring stringWithFormat:NSLocalizedString(@"Found results: %d",nil),_filter.resultsCount];    [vIEw addSubvIEw:TitleLabel];    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"|-[TitleLabel]-|" options:0 metrics:nil vIEws:NSDictionaryOfVariableBindings(TitleLabel)];    [vIEw addConstraints:constraints];    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"|-[tf]-|" options:0 metrics:nil vIEws:NSDictionaryOfVariableBindings(tf)];    [vIEw addConstraints:constraints];    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[TitleLabel]-8-[tf]|" options:0 metrics:nil vIEws:NSDictionaryOfVariableBindings(TitleLabel,tf)];    [vIEw addConstraints:constraints];}

错误信息：

Unable to simultaneously satisfy constraints.    Probably at least one of the constraints in the following List is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSautoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIVIEw property translatesautoresizingMaskIntoConstraints) (    "<NSLayoutConstraint:0x15dd2fc0 V:|-(0)-[UILabel:0x15dd1e10]   (names: '|':UIVIEw:0x15dc4f90 )>","<NSLayoutConstraint:0x15dd3120 V:[UILabel:0x15dd1e10]-(8)-[UITextFIEld:0x15dbe780]>","<NSautoresizingMaskLayoutConstraint:0x15de2300 h=--& v=--& UITextFIEld:0x15dbe780.mIDY ==>")Will attempt to recover by breaking constraint <NSLayoutConstraint:0x15dd3120 V:[UILabel:0x15dd1e10]-(8)-[UITextFIEld:0x15dbe780]>Break on objc_exception_throw to catch this in the deBUGger.The methods in the UIConstraintBasedLayoutDeBUGging category on UIVIEw Listed in <UIKit/UIVIEw.h> may also be helpful.2014-07-14 14:01:30.216 DossIErPolice[4724:60b] Unable to simultaneously satisfy constraints.    Probably at least one of the constraints in the following List is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSautoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIVIEw property translatesautoresizingMaskIntoConstraints) (    "<NSLayoutConstraint:0x15dd2e20 H:[UITextFIEld:0x15dbe780]-(Nsspace(20))-|   (names: '|':UIVIEw:0x15dc4f90 )>","<NSautoresizingMaskLayoutConstraint:0x15de1ee0 h=--& v=--& UITextFIEld:0x15dbe780.mIDX ==>","<NSautoresizingMaskLayoutConstraint:0x15de22d0 h=--& v=--& H:[UITextFIEld:0x15dbe780(0)]>","<NSautoresizingMaskLayoutConstraint:0x13a9eda0 h=--& v=--& H:[UIVIEw:0x15dc4f90(320)]>")Will attempt to recover by breaking constraint <NSLayoutConstraint:0x15dd2e20 H:[UITextFIEld:0x15dbe780]-(Nsspace(20))-|   (names: '|':UIVIEw:0x15dc4f90 )>Break on objc_exception_throw to catch this in the deBUGger.The methods in the UIConstraintBasedLayoutDeBUGging category on UIVIEw Listed in <UIKit/UIVIEw.h> may also be helpful.2014-07-14 14:01:30.217 DossIErPolice[4724:60b] Unable to simultaneously satisfy constraints.    Probably at least one of the constraints in the following List is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSautoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIVIEw property translatesautoresizingMaskIntoConstraints) (    "<NSLayoutConstraint:0x15dd3160 V:[UITextFIEld:0x15dbe780]-(0)-|   (names: '|':UIVIEw:0x15dc4f90 )>","<NSautoresizingMaskLayoutConstraint:0x15de2300 h=--& v=--& UITextFIEld:0x15dbe780.mIDY ==>","<NSautoresizingMaskLayoutConstraint:0x15de2330 h=--& v=--& V:[UITextFIEld:0x15dbe780(0)]>","<NSautoresizingMaskLayoutConstraint:0x13a9ee00 h=--& v=--& V:[UIVIEw:0x15dc4f90(88)]>")Will attempt to recover by breaking constraint <NSLayoutConstraint:0x15dd3160 V:[UITextFIEld:0x15dbe780]-(0)-|   (names: '|':UIVIEw:0x15dc4f90 )>Break on objc_exception_throw to catch this in the deBUGger.The methods in the UIConstraintBasedLayoutDeBUGging category on UIVIEw Listed in <UIKit/UIVIEw.h> may also be helpful.

解决方法 你忘了在tf上将translatesautoresizingMaskIntoConstraints设置为NO.此属性可防止布局引擎自动将旧样式自动调整掩码转换为约束,这就是错误的原因. 总结

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