masonry
translatesAutoresizingMaskIntoconstraints
当您通过添加自己的约束条件，使用自动布局来定位视图时，必须将该属性设置为NO。
默认为YES,IB会自动给你设置为NO，代码的话需要代码修改.
make:
(MASconstraint *)left {
(MASConstraint *)top {
(MASConstraint *)right {
(MASConstraint *)bottom {
(MASConstraint *)leading {
(MASConstraint *)trailing {
(MASConstraint *)width {
(MASConstraint *)height {
(MASConstraint *)centerX {
(MASConstraint *)centerY {
(MASConstraint *)baseline {
====================================
- (MASConstraint *)edges {
(MASConstraint *)size {
(MASConstraint *)center {
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
参数类型
make.right.mas_equalTo(superView.mas_right). offset(padding.right);
make.edges.mas_equalTo(superView). insets(edgePadding);
make.size.equalTo(superview). sizeoffset(CGSizeMake(100, -50))
make.center.equalTo(superview).centerOffset(CGPointMake(-5, 10))
修改constraint
（1）
@property (nonatomic, strong) MASConstraint *topConstraint;
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
self.topConstraint = make.top.equalTo(superview.mas_top).with.offset(padding.top);
make.left.equalTo(superview.mas_left).with.offset(padding.left);
}];
❗️[self.topConstraint uninstall];
（2）
// this is APPle’s recommended place for adding/updating constraints
// this method can get called multiple times in response to setNeedsUpdateConstraints
// which can be called by UIKit internally or in your code if you need to trigger an update to your constraints
- (void)updateConstraints {
[self.growingButton mas_updateConstraints:^(MASConstraintMaker *make) {
make.center.equalTo(self);
make.width.equalTo(@(self.buttonSize.width)).priorityLow();
make.height.equalTo(@(self.buttonSize.height)).priorityLow();
make.width.lessThanOrEqualTo(self);
make.height.lessThanOrEqualTo(self);
}];
//according to apple super should be called at end of method
[super updateConstraints];
}
实例
//
// SecondView.m
// News
//
#import "SecondView.h"
#import <Masonry.h>
@interface SecondView ()
@property (nonatomic,strong)UIView *testView;
@end
@implementation SecondView
- (id)init {
self = [super init];
if (!self) return nil;
// [self systemMethod];
// [self masonryMethod];
[self masonryMethod1];
return self;
}
- (void) systemMethod {
UIView *superview = self;
UIView *view1 = [[UIView alloc] init];
view1.translatesAutoresizingMaskIntoConstraints = NO; // Default:YES
view1.backgroundcolor = [uicolor grayColor];
[superview addSubview:view1];
UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);
[NSLayoutConstraint activateConstraints:@[[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],
]];
}
- (void) masonryMethod {
UIView * superView = self;
UIView * view = [[UIView alloc] init];
view.backgroundColor = [UIColor yellowColor];
[self addSubview:view];
// UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, -10, -10);
// [view mas_makeConstraints:^(MASConstraintMaker *make) {
// make.top.mas_equalTo(superView.mas_top).offset(padding.top);
// make.left.mas_equalTo(superView.mas_left).offset(padding.left);
// make.right.mas_equalTo(superView.mas_right).offset(padding.right);
// make.bottom.mas_equalTo(superView.mas_bottom).offset(padding.bottom);
// }];
UIEdgeInsets edgePadding = UIEdgeInsetsMake(10, 10, 10, 10);
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.mas_equalTo(superView).insets(edgePadding);
// 上下左右边距可以用edge代替。
// ❗️❗️❗️ 在使用Masonry添加约束之前，需要在addSubview之后才能使用，否则会导致崩溃。
}];
}
- (void) masonryMethod1 {
UIView * view = [[UIView alloc] init];
view.backgroundColor = UIColor.greenColor;
[self addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.width.equalTo(@100); // NSNumber 赋值
make.height.greaterThanOrEqualTo(@30);
make.center.equalTo(self);
}];
UIButton * button = [UIButton buttonWithType:UIButtontypesystem];
button.backgroundColor = UIColor.grayColor;
[button settitle:@"updateConstraint" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonclcik) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:button];
[button mas_makeConstraints:^(MASConstraintMaker *make) {
make.width.equalTo(@100); // NSNumber 赋值
make.height.greaterThanOrEqualTo(@30);
make.centerX.equalTo(view);
make.top.equalTo(view).offset(30);
}];
self.testView = [[UIView alloc] init];
self.testView.backgroundColor = UIColor.yellowColor;
[self addSubview:self.testView];
[self.testView mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.equalTo(view);
make.left.equalTo(view.mas_right).offset(30);
make.centerY.equalTo(view);
}];
}
- (void)buttonclcik {
// 更新cosntraint
[self setNeedsUpdateConstraints];
[self updateConstraintsIfneeded];
[UIView animateWithDuration:0.4 animations:^{
[self layoutIfNeeded];
}];
}
// 更新约束
- (void)updateConstraints {
// [self.testView mas_updateConstraints:^(MASConstraintMaker *make) {
// make.size.mas_equalTo(CGSizeMake(100, 30));
// make.center.mas_equalTo(self).centerOffset(CGPointMake(-100, -100));
//
// }];
// super方法放在方法最后面执行
[super updateConstraints];
}
@end
文章最后发布于: 2018-06-21 18:06:31
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