为 iOS 生成带有两个参数的按钮网格

Posted 2023-03-22

【中文标题】为 iOS 生成带有两个参数的按钮网格

【英文标题】：Generate grid of buttons with two parameters for iOS

【发布时间】：2012-05-07 10:49:33

【问题描述】：

我需要为 ios 应用程序生成一个按钮网格。每个按钮需要两个参数：列数和行数。按钮也有两种状态，激活和停用。

加载应用时，我希望有 21 行和 16 列。屏幕上的某个地方还会有一个按钮，上面写着“添加列”，每次单击它都会添加 4 个额外的列。

任何建议我应该如何做到这一点？我可以先在 IB 中添加前 21*16 按钮，但这是否允许我稍后用额外的列来扩展它，以及如何？

编辑：赏金只是开始奖励 mbm30075，不需要新的答案

【参考方案1】：

我相信这是一个更完整的解决方案。这是我为测试而编写的 .h/.m 对：

ViewController.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController 
@property (assign, nonatomic) int numColumns;
@property (assign, nonatomic) int numRows;
@property (strong, nonatomic) NSMutableArray *buttonsArray;
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;
@property (strong, nonatomic) IBOutlet UIButton *addButtons;
@property (strong, nonatomic) IBOutlet UIView *buttonsView;
- (IBAction)addFourMoreColumns;
@end

ViewController.m

#import "ViewController.h"
@implementation ViewController
@synthesize addButtons;
@synthesize buttonsArray;
@synthesize buttonsView;
@synthesize numColumns;
@synthesize numRows;
@synthesize scrollView;
- (void)viewDidLoad 
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self setButtonsArray:[NSMutableArray array]];
    [self setNumColumns:16];
    [self setNumRows:21];
    [self layoutButtons];

- (void)layoutButtons 
    static int width  = 100;
    static int height = 37;
    static int buffer = 8; // space between buttons (horiz. & vert.)
    static int margin = 20;
    CGPoint topLeft = CGPointMake(margin,margin); // standard "top left" in iOS
    // Since you appear to be wanting to modify the number of columns,
    // I'm going to make the multi-dimension array an array of columns, 
    // with each column containing an array of buttons (representing the rows)

    // Iterate through how many columns SHOULD exist ([self numColumns])
    for (int i = 0; i < [self numColumns]; i = i + 1) 
        // Check if this "column" exists (does this index exist in [self buttonsArray]?)
        if (i >= [[self buttonsArray] count]) 
            // It doesn't exist, so we need to add a blank array
            [[self buttonsArray] addObject:[NSMutableArray array]];
        
        NSMutableArray *column = [[self buttonsArray] objectAtIndex:i];
        // Now, we iterate through how many rows/buttons SHOULD exist ([self numRows])
        for (int j = 0; j < [self numRows]; j = j + 1) 
            // Check if this "row"/"cell"/"button" exists
            if (j >= [column count]) 
                // It doesn't exist, so we need to add a new button AND PLACE IT!
                // Of course, you need to make your button type correctly
                // This is just standard button code...
                UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
                [btn setFrame:CGRectMake(topLeft.x,topLeft.y,width,height)];
                // Do whatever else you need to do with the button...
                // Set title...
                [btn setTitle:[NSString stringWithFormat:@"(%d,%d)", i + 1, j + 1] forState:UIControlStateNormal];
                // Add target actions...
                [btn addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
                // Add the button to the view
                [[self buttonsView] addSubview:btn];
                // Add the button to the array
                [column addObject:btn];
            
            // Increment topLeft to the next "row" for correct button placement...
            topLeft = CGPointMake(topLeft.x, topLeft.y + height + buffer);
        
        // Increment topLeft to the next "column" for correct button placement...
        topLeft = CGPointMake(topLeft.x + width + buffer, margin);
    
    // So, I'm assuming your "add columns" button will be placed equivalent to 
    // "(columnCount + 1, 1)", or at the top of the screen, just to the right
    // of the right-most column of buttons
    // [self addButtons] is the property to the UIButton that calls [self addFourMoreColumns]
    [[self addButtons] setFrame:CGRectMake(topLeft.x, topLeft.y, [[self addButtons] frame].size.width, [[self addButtons] frame].size.height)];
    // Now, update the view that holds the buttons to give it a new size (based on the buttons added)
    CGRect viewFrame = CGRectMake(0, 0, CGRectGetMaxX([[self addButtons] frame]) + buffer, 20 + ([[self buttonsArray] count] * (height + buffer)));
    [[self buttonsView] setFrame:viewFrame];
    [[self scrollView] setContentSize:viewFrame.size];
    // Redraw the view...
    [[self view] setNeedsDisplay];

- (IBAction)addFourMoreColumns 
    [self setNumColumns:[self numColumns] + 4];
    [self layoutButtons];

// Shows in the log which button you pressed: "(col, row)"
- (void)buttonPressed:(id)sender 
    for (int i = 0; i < [[self buttonsArray] count]; i = i + 1) 
        NSMutableArray *col = [[self buttonsArray] objectAtIndex:i];
        for (int j = 0; j < [col count]; j = j + 1) 
            if (sender == [col objectAtIndex:j]) 
                NSLog(@"button (%d,%d) pressed", i + 1, j + 1);
                break;
            
        
    

@end

Xib 设置是基本的：

View                 // tied to [ViewController view]
|
--->ScrollView       // tied to [ViewController scrollView]
    |
    --->View         // tied to [ViewController buttonsView]
        |
        --->UIButton // tied to [ViewController addButtons]

【讨论】：

非常感谢您写下如此完整的示例。我试试看

当然！让我知道事情的后续。它对我有用，但如果您需要任何调整，请告诉我。

addButtons 按钮的放置位置是否重要？我需要它与滚动视图处于同一级别（因此在滚动视图之外）。另外，addButtons 应该调用 addFourMoreColumns 操作，对吗？

哦，还有一个问题：为什么在滚动视图中需要另一个视图？按钮不能直接进入滚动视图吗？

每次我使用UIScrollView 或看到关于它的教程/演示时，它总是在其中托管另一个UIView。然后，您设置[UIScrollView setContentSize:[UIView frame].size];。这可能不是唯一的方法，但这是我一直这样做的方法。好问题。我今晚去看看！

【参考方案2】：

这可以使用滚动视图UIScrollView 并使用两个for 循环在运行时添加所需按钮来实现，例如

for(int col = 0; col < [max column]; col++)

   for(int row = 0; row < [max row]; row++)
   
      //add buttons assigning them proper frame size
   
 

【参考方案3】：

您需要使用 2 个循环以编程方式添加按钮。还要识别按钮为它们分配标签，这些标签是由列号和行号组合而成的数字。 例如：- 第 1 行和第 1 列的按钮的标签可能为 11。 使用标签值，您可以识别单击了哪个按钮并执行相应的操作。