UIViewAutoresizing

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最近闲来独自搞了个app上架，目前还在审核， 该应用在很多场景下都用了自定义的弹出视图，所有抽空把它抽出来做成一个单独 PopupView 控件，已经放在github，支持cocoapods了，欢迎 star，哈哈，这都是闲话，主要是控件涉及界面相关的内容，平常都用习惯了 Masonry 了，再加上自己毕业后就开始写SDK，界面写得还真的不多，控件开源出去就不方便用 Masonry 了，只能用原生的了。

作为一名程序猿，不懂不耻，现学现卖 ^_

先看 UIViewAutoresizing 内容：

typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
    UIViewAutoresizingNone                 = 0,
    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,
    UIViewAutoresizingFlexibleWidth        = 1 << 1,
    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,
    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,
    UIViewAutoresizingFlexibleHeight       = 1 << 4,
    UIViewAutoresizingFlexibleBottomMargin = 1 << 5
};

• UIViewAutoresizingNone：就是不改变大小，不解释
• UIViewAutoresizingFlexibleLeftMargin：调整与父视图左边距，保证右边距不变

这个就是相当于宽度固定时，Masonry 中：

make.right.mas_equalTo(weakSelf.view.mas_left).offset(-OFFSET);

• UIViewAutoresizingFlexibleRightMargin: 调整与父视图右边距，保证左边距不变，和UIViewAutoresizingFlexibleLeftMargin 正好相反
• UIViewAutoresizingFlexibleWidth：就是上面两个的结合体，左右边距不变，改变大小适应， 相当于：

UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin

注意，可以通过 | 结合多个条件来完成所要的效果。

下面就不啰嗦了：

• UIViewAutoresizingFlexibleTopMargin：下边距不变，上边距适应
• UIViewAutoresizingFlexibleBottomMargin：和UIViewAutoresizingFlexibleTopMargin相反
• UIViewAutoresizingFlexibleHeight：

UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin

这里就不过多闲话了，demo 源码直接贴出：

@interface ViewController ()
@property(nonatomic, strong) UIView *subview1;
@property(nonatomic, strong) UIView *subview2;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self prepareSubview];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

#pragma mark - prepare method
- (void)prepareSubview {
    [self.view addSubview:self.subview1];
    self.subview2.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;
    [self.subview1 addSubview:self.subview2];
}

#pragma mark - setter
- (UIView *)subview1 {
    if (!_subview1) {
        _subview1 = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 300, 300)];
        _subview1.backgroundColor = [UIColor blueColor];
    }
    return _subview1;
}

- (UIView *)subview2 {
    if (!_subview2) {
        _subview2 = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 200, 200)];
        _subview2.backgroundColor = [UIColor redColor];
    }
    return _subview2;
}

- (IBAction)buttonClick:(id)sender {
    UIButton *button = (UIButton *)sender;
    if (!button.isSelected) {
        self.subview1.frame = CGRectMake(0, 100, 400, 400);
        button.selected = YES;
    } else {
        self.subview1.frame = CGRectMake(0, 100, 300, 300);
        button.selected = NO;
    }  
}
@end

这里通过设置 self.subview2.autoresizingMask 的值去查看各种效果，使用过 autolayout 的朋友应该都能秒上手了。

不为不会而耻，只因不学而愧，生命不息学习不止，偶尔打点小鸡血^_ YHPopupView 欢迎各位star & fork，准备这周出 PopupView 形式的自定义AlertView。