how create uilabel's dynamically from an NSMutableArray? - ios

Question

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

Answer 1

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];
}

Answer 2

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.

Answer 3

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.

Answer 4

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);
}