use sizeOfString to resize a view

set size.m

	CGSize constraint = CGSizeMake(200000.0, 10.0);
	CGSize size = [sourceLabel.text sizeWithFont:[UIFont italicSystemFontOfSize:7.0] constrainedToSize:constraint
						lineBreakMode:UILineBreakModeTailTruncation];
	sourceLabel.frame = CGRectMake(318.0 - size.width, 
								   quantityPickerView.frame.origin.y, 
								   size.width, 
								   size.height);