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
- (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];

}
　　 IOS自动布局
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