CODEWITHSUNDEEP
iosobjective-cuilabel
Fabio
Fabio

Reputation: 1973

how create uilabel's dynamically from an NSMutableArray?

NSMutableArray *items // contains 15 items

I need to put one down label from another i try something like this but not work

int count=20;

for(int i = 0; i < [items count]; i++){
        UILabel *label =  [[UILabel alloc] initWithFrame: CGRectMake(0,0,0,count)];
        label.text = @"text"; //etc...
        count+=20;

        [_scroll addSubview:label];

    }

What can i do thanks

Upvotes: 2

Views: 1808

Answers (4)

Koti Tummala
Koti Tummala

Reputation: 756

Here is the Swift version to add labels dynamically from array..

    var previousLabelHeight: CGFloat = 0.0;
    for dict in items {
        let text: String = "Some text to display in the UILabel"
        let size = heightNeededForText(text as NSString, withFont: UIFont.systemFontOfSize(15.0), width: scrollView.frame.size.width - 20, lineBreakMode: NSLineBreakMode.ByWordWrapping)
        let newLabelHeight = previousLabelHeight + size;
        let label =  UILabel(frame: CGRectMake(0, newLabelHeight, 0, 0))
        label.text = text
        label.sizeToFit() // resize the width and height to fit the text
        previousLabelHeight = newLabelHeight + 5 //adding 5 for padding
        scroll.addSubview(label)
    }

As sizeWithFont: ConstraintedToSize is deprecated from ios 7.0, we have to use boundingRectWithSize method from NSString....

func heightNeededForText(text: NSString, withFont font: UIFont, width: CGFloat, lineBreakMode:NSLineBreakMode) -> CGFloat {
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineBreakMode = lineBreakMode
    let size: CGSize = text.boundingRectWithSize(CGSizeMake(width, CGFloat.max), options: [.UsesLineFragmentOrigin, .UsesFontLeading], attributes: [ NSFontAttributeName: font, NSParagraphStyleAttributeName: paragraphStyle], context: nil).size//text boundingRectWithSize:CGSizeMake(width, CGFLOAT_MA

    return ceil(size.height);
}

Upvotes: 0

Chahal
Chahal

Reputation: 1005

As suggested by rmaddy...adding a new line to adjust the height of the label as well, assumed that you have an NSMutableArray object 'items' containing strings.

float previousLabelHeight = 0.0;
for(int i = 0; i < [items count]; i++){
       CGSize theSize = [[items objectAtIndex: i] sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(320, FLT_MAX) lineBreakMode:UILineBreakModeWordWrap]; //can adjust width from 320 to whatever you want and system font as well
       float newLabelHeight = previousLabelHeight + theSize.height;
       UILabel *label =  [[UILabel alloc] initWithFrame: CGRectMake(0,newLabelHeight,0,0)];
       label.text = [items objectAtIndex: i];
       [label sizeToFit]; // resize the width and height to fit the text
       previousLabelHeight = newLabelHeight + 5 //adding 5 for padding

       [_scroll addSubview:label];
}

Cheers,

Happy Coding.

Upvotes: 3

rmaddy
rmaddy

Reputation: 318814

You need to set the frame properly.

int count=20;

for(int i = 0; i < [items count]; i++){
    UILabel *label =  [[UILabel alloc] initWithFrame: CGRectMake(0,count,0,0)];
    label.text = @"text"; //etc...
    [label sizeToFit]; // resize the width and height to fit the text
    count+=20;

    [_scroll addSubview:label];
}

Upvotes: 5

Chuck
Chuck

Reputation: 237060

I think you're trying to change the frame's Y value, but the last parameter of CGRectMake() is the rect's height. You want the second parameter.

Upvotes: 0

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