在网上看到一篇blog，超正！快速领会ios的vfl。 这里贴上blog的地址。
https://github.com/ariok/TB_ProgrammaticallyAutoLayout 代码demo
demo代码如下：
/* Initial views setup */ - (void)setupViews
{
self.redView = [UIView new];
self.redView.translatesAutoresizingMaskIntoConstraints = NO;
self.redView.backgroundColor = [UIColor colorWithRed:0.95 green:0.47 blue:0.48 alpha:1.0]; self.yellowView = [UIView new];
self.yellowView.translatesAutoresizingMaskIntoConstraints = NO;
self.yellowView.backgroundColor = [UIColor colorWithRed:1.00 green:0.83 blue:0.58 alpha:1.0]; [self.view addSubview:self.redView];
[self.view addSubview:self.yellowView]; } /*
Hey Devs... the code in the next functions has to be intended for tutorial purposes only.
I have created work-alone examples that contain a lot of code duplication... not a good practice but way easier to explain :P
*/ /* EXAMPLE 1 */ - (void)example_1
{ // 1. Create a dictionary of views
NSDictionary *viewsDictionary = @{@"redView":self.redView}; // 2. Define the redView Size
NSArray *constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[redView(100)]"
options:
metrics:nil
views:viewsDictionary]; NSArray *constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[redView(100)]"
options:
metrics:nil
views:viewsDictionary];
[self.redView addConstraints:constraint_H];
[self.redView addConstraints:constraint_V]; // 3. Define the redView Position
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-30-[redView]"
options:
metrics:nil
views:viewsDictionary]; NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[redView]"
options:
metrics:nil
views:viewsDictionary]; // 3.B ...and try to change the visual format string
//NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[redView]-30-|" options:0 metrics:nil views:viewsDictionary];
//NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[redView]" options:0 metrics:nil views:viewsDictionary]; [self.view addConstraints:constraint_POS_H];
[self.view addConstraints:constraint_POS_V];
} /* EXAMPLE 2 */ - (void)example_2
{ // 1. Create a dictionary of views
NSDictionary *viewsDictionary = @{@"redView":self.redView, @"yellowView":self.yellowView}; // 2. Define the views Sizes
NSArray *red_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[redView(100)]"
options:
metrics:nil
views:viewsDictionary];
NSArray *red_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[redView(100)]"
options:
metrics:nil
views:viewsDictionary];
[self.redView addConstraints:red_constraint_H];
[self.redView addConstraints:red_constraint_V]; NSArray *yellow_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[yellowView(200)]"
options:
metrics:nil
views:viewsDictionary]; NSArray *yellow_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[yellowView(100)]"
options:
metrics:nil
views:viewsDictionary];
[self.yellowView addConstraints:yellow_constraint_H];
[self.yellowView addConstraints:yellow_constraint_V]; // 3. Define the views Positions
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-30-[redView]-40-[yellowView]"
options:
metrics:nil
views:viewsDictionary]; NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[redView]-10-[yellowView]"
options:
metrics:nil
views:viewsDictionary]; [self.view addConstraints:constraint_POS_V];
[self.view addConstraints:constraint_POS_H]; } /* EXAMPLE 3 */ - (void)example_3
{ // 1. Create a dictionary of views
NSDictionary *viewsDictionary = @{@"redView":self.redView, @"yellowView":self.yellowView}; // 2. Define the views Sizes
NSArray *red_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[redView(100)]"
options:
metrics:nil
views:viewsDictionary]; NSArray *red_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[redView(100)]"
options:
metrics:nil
views:viewsDictionary];
[self.redView addConstraints:red_constraint_H];
[self.redView addConstraints:red_constraint_V]; NSArray *yellow_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[yellowView(150)]"
options:
metrics:nil
views:viewsDictionary]; NSArray *yellow_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[yellowView(100)]"
options:
metrics:nil
views:viewsDictionary];
[self.yellowView addConstraints:yellow_constraint_H];
[self.yellowView addConstraints:yellow_constraint_V]; // 3. Define the views Positions using options
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-120-[redView]"
options:
metrics:nil
views:viewsDictionary]; NSArray *constraint_POS = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[redView]-10-[yellowView]"
options:NSLayoutFormatAlignAllTop
metrics:nil views:viewsDictionary]; [self.view addConstraints:constraint_POS_V];
[self.view addConstraints:constraint_POS]; } /* EXAMPLE 4 */ - (void)example_4
{
// 1. Create a dictionary of views and metrics
NSDictionary *viewsDictionary = @{@"redView":self.redView, @"yellowView":self.yellowView};
NSDictionary *metrics = @{@"redWidth": @,
@"redHeight": @,
@"yellowWidth": @,
@"yellowHeight": @,
@"topMargin": @,
@"leftMargin": @,
@"viewSpacing":@
}; // 2. Define the views Sizes
NSArray *red_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[redView(redHeight)]"
options:
metrics:metrics
views:viewsDictionary]; NSArray *red_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[redView(redWidth)]"
options:
metrics:metrics
views:viewsDictionary];
[self.redView addConstraints:red_constraint_H];
[self.redView addConstraints:red_constraint_V]; NSArray *yellow_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[yellowView(yellowHeight)]"
options:
metrics:metrics
views:viewsDictionary]; NSArray *yellow_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[yellowView(yellowWidth)]"
options:
metrics:metrics
views:viewsDictionary]; [self.yellowView addConstraints:yellow_constraint_H];
[self.yellowView addConstraints:yellow_constraint_V]; // 3. Define the views Positions
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-topMargin-[redView]"
options:
metrics:metrics
views:viewsDictionary]; NSArray *constraint_POS = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-leftMargin-[redView]-viewSpacing-[yellowView]"
options:NSLayoutFormatAlignAllTop
metrics:metrics
views:viewsDictionary]; [self.view addConstraints:constraint_POS_V];
[self.view addConstraints:constraint_POS];
} /* EXAMPLE 5 */ - (void)example_5
{
// 1. Create a dictionary of views and metrics
NSDictionary *viewsDictionary = @{@"redView":self.redView};
NSDictionary *metrics = @{@"vSpacing":@, @"hSpacing":@}; // 2. Define the view Position and automatically the Size
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-vSpacing-[redView]-vSpacing-|"
options:
metrics:metrics
views:viewsDictionary]; NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hSpacing-[redView]-hSpacing-|"
options:
metrics:metrics
views:viewsDictionary]; [self.view addConstraints:constraint_POS_V];
[self.view addConstraints:constraint_POS_H];
} /* EXAMPLE 6 */ - (void)example_6
{
// 1. Create a dictionary of views
NSDictionary *viewsDictionary = @{@"redView": self.redView, @"yellowView": self.yellowView};
NSDictionary *metrics = @{@"vSpacing":@, @"hSpacing":@}; // 2. Define the view Position and automatically the Size (for the redView)
NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-vSpacing-[redView]-vSpacing-|"
options:
metrics:metrics
views:viewsDictionary]; NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hSpacing-[redView]-hSpacing-|"
options:
metrics:metrics
views:viewsDictionary]; [self.view addConstraints:constraint_POS_V];
[self.view addConstraints:constraint_POS_H]; // 3. Define sizes thanks to relations with another view (yellowView in relation with redView)
[self.view addConstraint:[NSLayoutConstraint
constraintWithItem:self.yellowView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.redView
attribute:NSLayoutAttributeWidth
multiplier:0.5
constant:0.0]]; [self.view addConstraint:[NSLayoutConstraint
constraintWithItem:self.yellowView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.redView
attribute:NSLayoutAttributeHeight
multiplier:0.5
constant:0.0]]; // 4. Define position thanks to relations with another view (yellowView in relation with redView)
[self.view addConstraint:[NSLayoutConstraint
constraintWithItem:self.yellowView
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:self.redView
attribute:NSLayoutAttributeCenterX
multiplier:1.0
constant:0.0]]; [self.view addConstraint:[NSLayoutConstraint
constraintWithItem:self.yellowView
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:self.redView
attribute:NSLayoutAttributeCenterY
multiplier:1.0
constant:0.0]]; }
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