iOS AutoLayout 自动布局
原文出自 http://www.cnblogs.com/warrior/p/3630372.html
感谢原创作者
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];
}
|
