在项目中使用Masonry实现自动布局Autolayout(1)

最近都在研究Autolayout的内容，随着iPhone手机屏幕尺寸的增加，屏幕适配变得尤为重要；适配有多种方式，当然也是可以根据相对位置来适配，但是计算尺寸和代码量可能有些大（如果不嫌麻烦的话）；而另外一种就是Autolayout，网上有很多直接拖拽控件来适配界面的教程，但是自己习惯用纯代码写UI，所以还是用纯代码写。起初，看Apple的Autolayout，只能说头都大，几个简单的UI约束就要很多代码，看起来也费尽。这里有篇文章，感兴趣的可以参考了解一下：http://chun.tips/blog/2014/10/27/wei-iphone6she-ji-zi-gua-ying-bu-ju-(chun-dai-ma-shi-xian-)/。

Masonry，一个轻量级的布局框架，同时支持iOS和Mac OS X，采用DSL链式语法，只能说，这个框架很好用，github地址：Masonry 。

这个框架有比较多的属性，这里不一一列举了，比较常用的属性有，这些属性与NSLayoutAttrubute的对照表如下：



github主页上也有相关的说明、例子等。我要做成的效果如下：





具体的布局思路如下：



下面是主要代码的实现部分：

[objc] view
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//表头视图

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

{

HeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kDeviceWidth, 2*(kDeviceHeight/9))];

HeaderView.backgroundColor = NAVIGATION_COLOR;

topView = [UIView new];

topView.backgroundColor = [UIColor clearColor];

[HeaderView addSubview:topView];

[topView mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.left.and.right.equalTo(HeaderView);

}];

UIView *buttomView = [UIView new];

buttomView.backgroundColor = [UIColor clearColor];

[HeaderView addSubview:buttomView];

[buttomView mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.right.and.bottom.equalTo(HeaderView);

make.top.equalTo(topView.mas_bottom);

make.width.and.height.equalTo(topView);

}];

headerImageV = [[UIImageView alloc] init];

headerImageV.clipsToBounds = YES;

headerImageV.layer.cornerRadius = (HeaderView.frame.size.height/2) / 2.0f;

headerImageV.image = [UIImage imageNamed:@"store.jpg"];

[HeaderView addSubview:headerImageV];

[headerImageV mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(headerImageV.mas_height).multipliedBy(1);

make.width.and.height.lessThanOrEqualTo(topView);

make.width.and.height.equalTo(topView).with.priorityLow();

make.centerX.equalTo(topView);

if (didRotato == NO) {

make.bottom.equalTo(topView.mas_bottom).offset(20);

}

else

{

make.top.equalTo(topView.mas_top);

}

}];

UILabel *shopNameL = [[UILabel alloc] init];

shopNameL.textColor = [UIColor whiteColor];

shopNameL.font = [UIFont systemFontOfSize:20];

shopNameL.textAlignment = NSTextAlignmentCenter;

shopNameL.text = @"精诚超市";

[HeaderView addSubview:shopNameL];

[shopNameL mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(headerImageV.mas_bottom);

make.left.and.right.equalTo(buttomView);

}];

UILabel *addressL = [[UILabel alloc] init];

addressL.font = [UIFont systemFontOfSize:10];

addressL.textAlignment = NSTextAlignmentRight;

addressL.textColor = [UIColor whiteColor];

addressL.text = @"天河区万佳广场首层234号";

[HeaderView addSubview:addressL];

UILabel *gwNumberL = [[UILabel alloc] init];

gwNumberL.font = addressL.font;

gwNumberL.textColor = addressL.textColor;

gwNumberL.textAlignment = NSTextAlignmentLeft;

gwNumberL.text = @" GW88888888";

[HeaderView addSubview:gwNumberL];

[addressL mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(shopNameL.mas_bottom);

make.left.equalTo(buttomView.mas_left);

make.right.equalTo(gwNumberL.mas_left);

make.height.equalTo(shopNameL.mas_height);

make.bottom.equalTo(buttomView.mas_bottom);

}];

[gwNumberL mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(shopNameL.mas_bottom);

make.left.equalTo(addressL.mas_right);

make.right.equalTo(buttomView.mas_right);

make.width.equalTo(addressL.mas_width);

make.height.equalTo(addressL.mas_height);

make.bottom.equalTo(buttomView.mas_bottom);

}];

return HeaderView;

}

cell中主要的布局代码如下：

[objc] view
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- (id) initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier

{

self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];

if (self) {

self.selectionStyle = UITableViewCellSelectionStyleNone;

_theImageV = [[UIImageView alloc] init];

_theImageV.autoresizingMask = UIViewAutoresizingFlexibleHeight;

[self.contentView addSubview:_theImageV];

_nameL = [[UILabel alloc] init];

_nameL.font = [UIFont systemFontOfSize:18];

[self.contentView addSubview:_nameL];

UIView *topView = [UIView new];

topView.backgroundColor = [UIColor clearColor];

[self.contentView addSubview:topView];

/* 约束关系 */

[topView mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.equalTo(self.contentView);

make.width.and.height.equalTo(self.contentView.mas_height);

}];

[_theImageV mas_makeConstraints:^(MASConstraintMaker *make) {

make.edges.equalTo(topView).insets(UIEdgeInsetsMake(12, 12, 12, 12)); //各边偏移12个点

make.center.equalTo(topView);

}];

[_nameL mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.equalTo(self.contentView);

make.left.equalTo(_theImageV.mas_right).insets(kPadding);

}];

}

return self;

}

你可以从github上获取到完整代码，地址：this