Question

我在我的应用中创建了83个动态按钮并为其设置标签。现在，我想为它设置自动布局。如何为此动态设置自动布局？

这是我为动态创建按钮和标签而实现的代码：

-(void)DynamicButton
{
    //Reading Data From database
    NSMutableArray *objectName = [[NSMutableArray alloc] init];
    NSArray *docPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentDir = [docPaths objectAtIndex:0];
    self.databasePath = [documentDir stringByAppendingPathComponent:@"SMS.sqlite"];

    FMDatabase *database = [FMDatabase databaseWithPath:self.databasePath];
    [database setLogsErrors:TRUE];
    [database open];

    //FMResultSet *results = [database executeQuery:@"SELECT * FROM SMSCategory"];
    NSString *anQuery = [[NSString alloc]initWithFormat:@"SELECT *FROM SMSCategory"];

    FMResultSet *results = [database executeQuery:anQuery];

    while ([results next]) {
        SMSCat1 *cat = [[SMSCat1 alloc]init];
        cat.Id = [results stringForColumn:@"Id"];
        cat.Name = [results stringForColumn:@"Name"];
        cat.IsActive = [results stringForColumn:@"IsActive"];
        [objectName addObject:cat];
    }
    [database close];


    //Adding dynamic buttons


    int yPossion = 150, xPossion = 44; int temp = 0;
    UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:self.view.frame];
    [self.view addSubview:scrollView];
    for (int i = 0; i < [objectName count]; i++) {
        SMSCat1 *cat = [objectName objectAtIndex:i];

        UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [aButton setTranslatesAutoresizingMaskIntoConstraints:YES];


        //Label Dynamic Code

        UILabel *label =  [[UILabel alloc] init];
        [label setText:cat.Name];
        [label setTextColor:[UIColor brownColor]];
        label.font = [UIFont systemFontOfSize:12];

        [label sizeToFit];

        [label setFrame:CGRectMake(5, 44, 70, 60)];
        [scrollView addSubview:label];
        [aButton addSubview:label];





        [aButton setBackgroundColor:[UIColor blackColor]];
        [aButton setBackgroundImage:[UIImage imageNamed:@"icon-menu.png"] forState:UIControlStateNormal];

        [aButton setTitle:[NSString stringWithFormat:@"%d", i] forState:UIControlStateNormal];

        [aButton setFrame:CGRectMake(xPossion, yPossion, 70, 60)];
        aButton.highlighted = YES;

        [scrollView addSubview:aButton];

        xPossion += aButton.frame.size.width + 35;
        temp++;
        if (temp == 3) {
            yPossion = aButton.frame.origin.y + aButton.frame.size.height + 20;
            temp = 0;
            xPossion = 44;
            yPossion += aButton.frame.size.width - 15;
            [scrollView setContentSize:CGSizeMake(scrollView.frame.size.width, yPossion - 50)];
        }
    }
}

Answer 1

为此使用自动布局时，您需要设置setTranslatesAutoresizingMaskIntoConstraints:NO。这允许您使用自己的约束设置对象的位置。使用自动布局放置对象时，您并不关心框架。您希望相对于其周围的对象或其父视图放置对象。例如，你可以这样做：

NSDictionary* views = @{@"label1":label1,@"button1":button};
  [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[label1]-(10)-[button1]" options:0 metrics:nil views:views]];
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:button attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0]];

这会将两个元素分开10个像素并将它们垂直居中。我不会查看您的代码并将其全部更改为自动布局，但您在我的示例中看到如何使用自动布局开始布置对象

Answer 2

for（int i = 0; i＆lt; [list count]; i ++）

    id val=[list objectAtIndex:i];
    CGFloat val1=[val floatValue];
    UILabel *newLabel = [[UILabel alloc] initWithFrame:CGRectMake(x, 0,107,40)];  
    newLabel.text=[NSString stringWithFormat:@"%@",list[i]];
    newLabel.textAlignment = NSTextAlignmentCenter;
    newLabel.backgroundColor = [UIColor greenColor];
    newLabel.layer.borderColor = [UIColor whiteColor].CGColor;
    newLabel.layer.borderWidth = 2;
    [self.view addSubview:newLabel];
    x=x+newLabel.frame.size.width;

如何在iOS中为多个动态按钮和标签设置自动布局？

2 个答案: