IOS自动布局

IOS自动布局

参考资料

https://developer.apple.com/library/mac/documentation/UserExperience/Conceptual/AutolayoutPG/VisualFormatLanguage/VisualFormatLanguage.html#//apple_ref/doc/uid/TP40010853-CH3

https://developer.apple.com/library/ios/technotes/tn2154/_index.html

https://developer.apple.com/library/mac/documentation/AppKit/Reference/NSLayoutConstraint_Class/NSLayoutConstraint/NSLayoutConstraint.html

开源项目Masonry旨在让自动布局（Auto Layout）的代码更简洁、可读性更强，下面是它的地址，个人认为在开发过程中使用Masonry可以是代码更加友好

https://github.com/cloudkite/Masonry

 

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- ( void )viewDidLoad {      [ super  viewDidLoad];            [ self  addNavigationBar:FEEDBACK_VIEW_CONTROLLER];        UILabel *note = [[UILabel alloc] init];      [note setText:@ "欢迎提出宝贵意见！您留下的每一份心意都将浇灌母婴宝的茁壮成长。" ];      [note setLineBreakMode: NSLineBreakByWordWrapping ];      note.numberOfLines = 0;      [ self .view addSubview:note];            //将自适应向布局约束的转化关掉(根据情况有时需要有时不需要)      [note setTranslatesAutoresizingMaskIntoConstraints: NO ];            [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:note                                                            attribute: NSLayoutAttributeTop                                                            relatedBy: NSLayoutRelationEqual                                                               toItem:navBar                                                            attribute: NSLayoutAttributeBottom                                                           multiplier:1.0                                                             constant:10]];            [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:note                                                            attribute: NSLayoutAttributeLeft                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeLeft                                                           multiplier:1.0                                                             constant:10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:note                                                            attribute: NSLayoutAttributeRight                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeRight                                                           multiplier:1.0                                                             constant:-10]];      UITextView *tfContent = [[UITextView alloc] init];      [tfContent setTranslatesAutoresizingMaskIntoConstraints: NO ];      [tfContent setBackgroundColor:[UIColor whiteColor]];      [tfContent setReturnKeyType:UIReturnKeyDone];      [ self .view addSubview:tfContent];            [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfContent                                                            attribute: NSLayoutAttributeTop                                                            relatedBy: NSLayoutRelationEqual                                                               toItem:note                                                            attribute: NSLayoutAttributeBottom                                                           multiplier:1.0                                                             constant:10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfContent                                                            attribute: NSLayoutAttributeLeft                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeLeft                                                           multiplier:1.0                                                             constant:10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfContent                                                            attribute: NSLayoutAttributeRight                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeRight                                                           multiplier:1.0                                                             constant:-10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfContent                                                            attribute: NSLayoutAttributeHeight                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: nil                                                            attribute: NSLayoutAttributeNotAnAttribute                                                           multiplier:1.0                                                             constant:100]];                  UITextField *tfEmail = [UITextField  new ];      [tfEmail setTranslatesAutoresizingMaskIntoConstraints: NO ];      [tfEmail setBackgroundColor:[UIColor whiteColor]];      [tfEmail setClearButtonMode:UITextFieldViewModeAlways];      [tfEmail setReturnKeyType:UIReturnKeyDone];      [tfEmail setPlaceholder:@ "请输入邮箱，以便我们联系你！" ];      [ self .view addSubview:tfEmail];            [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfEmail                                                            attribute: NSLayoutAttributeTop                                                            relatedBy: NSLayoutRelationEqual                                                               toItem:tfContent                                                            attribute: NSLayoutAttributeBottom                                                           multiplier:1.0                                                             constant:10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfEmail                                                            attribute: NSLayoutAttributeLeft                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeLeft                                                           multiplier:1.0                                                             constant:10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfEmail                                                            attribute: NSLayoutAttributeRight                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: self .view                                                            attribute: NSLayoutAttributeRight                                                           multiplier:1.0                                                             constant:-10]];      [ self .view addConstraint:[ NSLayoutConstraint  constraintWithItem:tfEmail                                                            attribute: NSLayoutAttributeHeight                                                            relatedBy: NSLayoutRelationEqual                                                               toItem: nil                                                            attribute: NSLayoutAttributeNotAnAttribute                                                           multiplier:1.0                                                             constant:35]];        UIButton *btnSubmit = [[UIButton alloc] init];      [btnSubmit setTranslatesAutoresizingMaskIntoConstraints: NO ];      [btnSubmit setTitle:STRING_COMMON_SUBMIT forState:UIControlStateNormal];      [btnSubmit setBackgroundImage:[UIImage imageNamed:@ "bg_red_orange" ] forState:UIControlStateNormal];      [btnSubmit setBackgroundImage:[UIImage imageNamed:@ "bg_red" ] forState:UIControlStateHighlighted];      [ self .view addSubview:btnSubmit];            NSMutableArray  *tmpConstraints = [ NSMutableArray  array];            [tmpConstraints addObjectsFromArray:[ NSLayoutConstraint  constraintsWithVisualFormat:@ "V:[tfEmail]-10-[btnSubmit(==35)]"  options:0 metrics: nil  views: NSDictionaryOfVariableBindings (tfEmail,btnSubmit)]];      [tmpConstraints addObjectsFromArray:[ NSLayoutConstraint  constraintsWithVisualFormat:@ "H:|-10-[btnSubmit]-10-|"  options:0 metrics: nil  views: NSDictionaryOfVariableBindings (btnSubmit)]];      [ self .view addConstraints:tmpConstraints];       }