UIViewAutoresizing

UIViewAutoresizing_第1张图片
C3E2BBAE-0C93-471C-B6BF-32DC42A8748F.png

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。

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