#Masonry [![Build Status](https://travis-ci.org/SnapKit/Masonry.svg?branch=master)](https://travis-ci.org/SnapKit/Masonry) [![Coverage Status](https://img.shields.io/coveralls/SnapKit/Masonry.svg?style=flat-square)](https://coveralls.io/r/SnapKit/Masonry) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
**Masonry is still actively maintained, we are committed to fixing bugs and merging good quality PRs from the wider community. However if you're using Swift in your project, we recommend using [SnapKit](https://github.com/SnapKit/SnapKit) as it provides better type safety with a simpler API.**
Masonry is a light-weight layout framework which wraps AutoLayout with a nicer syntax. Masonry has its own layout DSL which provides a chainable way of describing your NSLayoutConstraints which results in layout code that is more concise and readable.
Masonry supports iOS and Mac OS X.
For examples take a look at the **Masonry iOS Examples** project in the Masonry workspace. You will need to run `pod install` after downloading.
## What's wrong with NSLayoutConstraints?
Under the hood Auto Layout is a powerful and flexible way of organising and laying out your views. However creating constraints from code is verbose and not very descriptive.
Imagine a simple example in which you want to have a view fill its superview but inset by 10 pixels on every side
```obj-c
UIView *superview = self;
UIView *view1 = [[UIView alloc] init];
view1.translatesAutoresizingMaskIntoConstraints = NO;
view1.backgroundColor = [UIColor greenColor];
[superview addSubview:view1];
UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);
[superview addConstraints:@[
//view1 constraints
[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeTop
multiplier:1.0
constant:padding.top],
[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:padding.left],
[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeBottom
multiplier:1.0
constant:-padding.bottom],
[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeRight
multiplier:1
constant:-padding.right],
]];
```
Even with such a simple example the code needed is quite verbose and quickly becomes unreadable when you have more than 2 or 3 views.
Another option is to use Visual Format Language (VFL), which is a bit less long winded.
However the ASCII type syntax has its own pitfalls and its also a bit harder to animate as `NSLayoutConstraint constraintsWithVisualFormat:` returns an array.
## Prepare to meet your Maker!
Heres the same constraints created using MASConstraintMaker
```obj-c
UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(superview.mas_top).with.offset(padding.top); //with is an optional semantic filler
make.left.equalTo(superview.mas_left).with.offset(padding.left);
make.bottom.equalTo(superview.mas_bottom).with.offset(-padding.bottom);
make.right.equalTo(superview.mas_right).with.offset(-padding.right);
}];
```
Or even shorter
```obj-c
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(superview).with.insets(padding);
}];
```
Also note in the first example we had to add the constraints to the superview `[superview addConstraints:...`.
Masonry however will automagically add constraints to the appropriate view.
Masonry will also call `view1.translatesAutoresizingMaskIntoConstraints = NO;` for you.
## Not all things are created equal
> `.equalTo` equivalent to **NSLayoutRelationEqual**
> `.lessThanOrEqualTo` equivalent to **NSLayoutRelationLessThanOrEqual**
> `.greaterThanOrEqualTo` equivalent to **NSLayoutRelationGreaterThanOrEqual**
These three equality constraints accept one argument which can be any of the following:
#### 1. MASViewAttribute
```obj-c
make.centerX.lessThanOrEqualTo(view2.mas_left);
```
MASViewAttribute | NSLayoutAttribute
------------------------- | --------------------------
view.mas_left | NSLayoutAttributeLeft
view.mas_right | NSLayoutAttributeRight
view.mas_top | NSLayoutAttributeTop
view.mas_bottom | NSLayoutAttributeBottom
view.mas_leading | NSLayoutAttributeLeading
view.mas_trailing | NSLayoutAttributeTrailing
view.mas_width | NSLayoutAttributeWidth
view.mas_height | NSLayoutAttributeHeight
view.mas_centerX | NSLayoutAttributeCenterX
view.mas_centerY | NSLayoutAttributeCenterY
view.mas_baseline | NSLayoutAttributeBaseline
#### 2. UIView/NSView
if you want view.left to be greater than or equal to label.left :
```obj-c
//these two constraints are exactly the same
make.left.greaterThanOrEqualTo(label);
make.left.greaterThanOrEqualTo(label.mas_left);
```
#### 3. NSNumber
Auto Layout allows width and height to be set to constant values.
if you want to set view to have a minimum and maximum width you could pass a number to the equality blocks:
```obj-c
//width >= 200 && width <= 400
make.width.greaterThanOrEqualTo(@200);
make.width.lessThanOrEqualTo(@400)
```
However Auto Layout does not allow alignment attributes such as left, right, centerY etc to be set to constant values.
So if you pass a NSNumber for these attributes Masonry will turn these into constraints relative to the view’s superview ie:
```obj-c
//creates view.left = view.superview.left + 10
make.left.lessThanOrEqualTo(@10)
```
Instead of using NSNumber, you can use primitives and structs to build your constraints, like so:
```obj-c
make.top.mas_equalTo(42);
make.height.mas_equalTo(20);
make.size.mas_equalTo(CGSizeMake(50, 100));
make.edges.mas_equalTo(UIEdgeInsetsMake(10, 0, 10, 0));
make.left.mas_equalTo(view).mas_offset(UIEdgeInsetsMake(10, 0, 10, 0));
```
By default, macros which support [autoboxing](https://en.wikipedia.org/wiki/Autoboxing#Autoboxing) are prefixed with `mas_`. Unprefixed versions are available by defining `MAS_SHORTHAND_GLOBALS` before importing Masonry.
#### 4. NSArray
An array of a mixture of any of the previous types
```obj-c
make.height.equalTo(@[view1.mas_height, view2.mas_height]);
make.height.equalTo(@[view1, view2]);
make.left.equalTo(@[view1, @100, view3.right]);
````
## Learn to prioritize
> `.priority` allows you to specify an exact priority
> `.priorityHigh` equivalent to **UILayoutPriorityDefaultHigh**
> `.priorityMedium` is half way between high and low
> `.priorityLow` equivalent to **UILayoutPriorityDefaultLow**
Priorities are can be tacked on to the end of a constraint chain like so:
```obj-c
make.left.greaterThanOrEqualTo(label.mas_left).with.priorityLow();
make.top.equalTo(label.mas_top).wi
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iOS开发:UICollectionView长按移动、添加、删除(仿支付宝首页中的全部功能).zip
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iOS开发:UICollectionView长按移动、添加、删除(仿支付宝首页中的全部功能).zip (67个子文件)
MoveAndDelete-master
README.md~acab289c83c4001af8dcc23dcbf3b1f3c87a8438 7KB
MoveAndDelete.xcodeproj
project.pbxproj 35KB
xcuserdata
dukaishun.xcuserdatad
xcschemes
MoveAndDelete.xcscheme 4KB
xcschememanagement.plist 665B
project.xcworkspace
contents.xcworkspacedata 158B
MoveAndDelete
Base.lproj
LaunchScreen.storyboard 2KB
AppDelegate.h 273B
Model
SYLifeManagerModel.h 280B
SYLifeManagerModel.m 207B
AppDelegate.m 2KB
main.m 330B
View
SYLifeManagerLayout.h 614B
SYLIfeManagerFooterView.h 232B
SYLifeManagerHeaderView.m 609B
SYLifeManagerLayout.m 5KB
SYLifeManagerCell.m 5KB
SYLifeManagerCell.h 777B
SYLifeManagerHeaderView.h 283B
SYLIfeManagerFooterView.m 392B
Controller
SYLifeManagerController.m 11KB
RootViewController.xib 3KB
SYLifeManagerController.h 333B
RootViewController.m 576B
RootViewController.h 218B
Info.plist 1KB
Assets.xcassets
life_exist.imageset
Contents.json 307B
life_exist.png 3KB
Contents.json 62B
wallet_payChange.imageset
Contents.json 313B
wallet_payChange.png 6KB
AppIcon.appiconset
Contents.json 1KB
life_add.imageset
life_add.png 3KB
Contents.json 305B
life_reduce.imageset
Contents.json 308B
life_reduce.png 3KB
MoveAndDeleteTests
MoveAndDeleteTests.m 913B
Info.plist 680B
README.md 7KB
MoveAndDeleteUITests
MoveAndDeleteUITests.m 1KB
Info.plist 680B
Masonry
LICENSE 1KB
README.md 16KB
Masonry
MASConstraint.h 7KB
MASViewAttribute.h 1KB
NSLayoutConstraint+MASDebugAdditions.h 326B
MASConstraintMaker.h 5KB
Masonry.h 802B
NSArray+MASAdditions.m 6KB
MASLayoutConstraint.m 227B
NSLayoutConstraint+MASDebugAdditions.m 5KB
MASConstraint+Private.h 2KB
MASConstraint.m 7KB
ViewController+MASAdditions.h 891B
MASCompositeConstraint.m 5KB
View+MASShorthandAdditions.h 3KB
NSArray+MASShorthandAdditions.h 1016B
MASViewConstraint.m 13KB
View+MASAdditions.h 4KB
MASUtilities.h 6KB
MASViewAttribute.m 1KB
MASConstraintMaker.m 9KB
NSArray+MASAdditions.h 3KB
MASLayoutConstraint.h 505B
View+MASAdditions.m 5KB
MASViewConstraint.h 1KB
MASCompositeConstraint.h 494B
ViewController+MASAdditions.m 1KB
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