iOS-九宫格布局

2023-11-22 09:05:03 浏览数 (3)

一个简单的九宫格布局

效果

思路
  • 利用控件的索引index计算出控件所在的行号和列号
  • 利用列号计算控件的x值
  • 利用行号计算控件的y值
需要设置一些固定值

布局列数: NSInteger cols = 3; 图片长宽 :NSInteger imageW = 100; NSInteger imageH = 100;

计算每张图片应该放在第几行和第几列
代码语言:javascript复制
NSInteger col = index % cols;
NSInteger row = index / cols;
计算图片布局间距
代码语言:javascript复制
CGFloat colMargin = (bgView.bounds.size.width - cols *imageW) / (cols - 1);
计算图片所在的x和y坐标
代码语言:javascript复制
CGFloat shopX = col * (imageW  colMargin);
CGFloat shopY = row * (imageH   colMargin);
创建控件,并添加到视图上(图片名称为:imageX)
代码语言:javascript复制
UIImageView *imageView =[[UIImageView alloc]init];
imageView.frame = CGRectMake(shopX, shopY, imageW, imageH);
[imageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"Image%ld",index]]];
[bgView addSubview:imageView];
整体代码
代码语言:javascript复制
- (void)viewDidLoad {
    [super viewDidLoad];
    
    for (NSInteger i = 0; i<9; i  ) {
        [self showImageView:self.view withImageIndex:i];
    }
}
- (void)showImageView:(UIView *)bgView withImageIndex:(NSInteger)index{
    
    //一行的列数
    NSInteger cols = 3;
    //图片大小
    NSInteger imageW = 100;
    NSInteger imageH = 100;
    
    //每一列的间距
    CGFloat colMargin = (bgView.bounds.size.width - cols *imageW) / (cols - 1);
    
    //图片所在列
    NSInteger col = index % cols;
    //图片所在行
    NSInteger row = index / cols;
    
    CGFloat shopX = col * (imageW  colMargin);
    CGFloat shopY = row * (imageH   colMargin);
    
    UIImageView *imageView =[[UIImageView alloc]init];
    imageView.frame = CGRectMake(shopX, shopY, imageW, imageH);
    [imageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"Image%ld",index]]];
    [bgView addSubview:imageView];
}

附上demo: ImageLayout

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