CATextLayer number of lines? - objective-c

Question

My CATextlayer support only 1 line
otherwise the text is cut.
trying to set text content like UILabel Behaviour... is it possible?
set "number of lines"
adjust text size by static CATextLayer frame
CATextLayer *text_layer= [[CATextLayer alloc] init];
[text_layer setBackgroundColor:[UIColor clearColor].CGColor];
[text_layer setBackgroundColor:[UIColor blueColor].CGColor];
[text_layer setForegroundColor:layers.textColor.CGColor];
[text_layer setAlignmentMode:kCAAlignmentCenter];
[text_layer setBorderColor:layers.borderColor.CGColor];
[text_layer setFrame:CGRectMake(0,0,200,50)]; //note: frame must be static
[text_layer setString:#"thank you for your respond"];
text_layer.wrapped = YES;
[text_layer setAlignmentMode:kCAAlignmentCenter];

Answer 1

Your problem is this line right here, [text_layer setFrame:CGRectMake(0,0,200,50)];. I don't think a CATextLayer would lay itself out to accommodate multiple lines. It will only re-draw the text to wrap within the layer's bounds. Try adjusting your text layer's frame based on the text being set. You can create a UILabel instance, to calculate the frame for having multiline text with word wrapping and set it to your CATextLayer instance.
Here's a UILabel category to calculate text size for multiline text with word wrapping:
#interface UILabel (Height)
- (CGSize)sizeForWrappedText;
#end
#implementation UILabel (Height)
- (CGSize)sizeForWrappedText {
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.bounds.size.width, CGFLOAT_MAX)];
label.numberOfLines = 0;
label.font = self.font;
label.text = self.text;
[label sizeToFit];
return label.frame.size;
}
#end
Create a UILabel instance, and use the sizeForWrappedText to get the size. Something like this:
// Make sure the someFrame here has the preferred width you want for your text_layer instance.
UILabel *label = [[UILabel alloc] initWithFrame:someFrame];
[label setText:#"My awesome text!"];
CGRect frame = text_layer.frame;
frame.size = [label sizeForWrappedText];
[text_layer setFrame:frame];