Changing text size in Pickerview - iphone

Question

How can we change the size of the text in a picker view?
Anyone please help.

Answer 1

You can change the font size of UIPickerView using code :
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row
forComponent:(NSInteger)component reusingView:(UIView *)view {
UILabel *retval = (id)view;
if (!retval) {
retval= [[[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView rowSizeForComponent:component].width, [pickerView rowSizeForComponent:component].height)] autorelease];
}
retval.font = [UIFont systemFontOfSize:22];
return retval;
}

Answer 2

For completeness, yakub_moriss code lacks of one line, which was in the post signaled by indragie. Without a line as
retval.text = [pickerViewArray objectAtIndex:row];
the picker will be empty.

Answer 3

This is also a great way to change the alignment of the text in the component too, change the textAlignment of the retval label.
Also, the background for the label should be set to clear:
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *retval = (id)view;
if (!retval) {
retval = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f,
[pickerView rowSizeForComponent:component].width,
[pickerView rowSizeForComponent:component].height)];
}
retval.opaque = NO;
retval.backgroundColor = [UIColor clearColor];
retval.font = [UIFont systemFontOfSize:28];
if (component == 0) {
retval.textAlignment = UITextAlignmentRight;
retval.text = [NSString stringWithFormat:#"%d ", row];
} else {
retval.textAlignment = UITextAlignmentLeft;
retval.text = [NSString stringWithFormat:#" .%d", row];
}
return retval;
}
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
if (component == 0) {
return 100;
}
return 88;
}

Answer 4

I'm using a category for this. It relies on this other category I have: http://compileyouidontevenknowyou.blogspot.com/2012/06/adding-properties-to-class-you-dont.html.
Anyway, this one looks like this:
#import <UIKit/UIKit.h>
#interface UIPickerView (CustomViewForRow)
#property (nonatomic, strong) UIFont *customViewForRowFont;
- (UIView *)customViewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;
#end
and the .m
#import "UIPickerView+CustomViewForRow.h"
#import "NSObject+AssociatedObjectSupport.h"
#implementation UIPickerView (CustomViewForRow)
static char keyForCustomViewForRowFont;
- (UIFont *)customViewForRowFont {
UIFont *retVal = [self associatedObject:&keyForCustomViewForRowFont];
if (!retVal)
retVal = [UIFont boldSystemFontOfSize:17];
return retVal;
}
- (void)setCustomViewForRowFont:(UIFont *)customViewForRowFont {
[self setAssociatedObject:customViewForRowFont forKey:&keyForCustomViewForRowFont];
}
- (UIView *)customViewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UILabel *label;
if (!view) {
view = [[UIView alloc] init];
CGRect frame = CGRectZero;
frame.size = [self rowSizeForComponent:component];
view.frame = frame;
view.backgroundColor = UIColor.clearColor;
label = [[UILabel alloc] init];
label.font = self.customViewForRowFont;
label.backgroundColor = [UIColor clearColor];
frame = view.bounds;
frame.origin.x += 7;
frame.size.width -= 14;
label.frame = frame;
[view addSubview:label];
}
label = [view.subviews objectAtIndex:0];
#try {
NSString *text = [self.delegate pickerView:self titleForRow:row forComponent:component];
if (!text)
text = #"???";
label.text = text;
} #catch (NSException *e) {
label.text = #"???";
}
return view;
}
#end

Answer 5

Try this
https://github.com/kafejo/CCPicker
it's very easy picker :)