how to change font size of date picker view and picker view in iOS Objective C

Question

I want to change font size of date picker and picker view. is this possible ? if is it? then how it done.

Answer 1

No you can't customise UIDatepicker, as per given on apple's Official site.

So Developer has no rights to change UIDatepicker.

Answer 2

There is no any API for change apperiance of UIDatePicker.

You can make a pretty convincing replica yourself using a UIPickerView

    - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return a;}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return b;}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {

UILabel *lblpkr= [[UILabel alloc] initWithFrame:CGRectMake(p,q,r,s)];
[lblpkr setBackgroundColor:[UIColor clearColor]];
[lblpkr setTextColor:[UIColor blueColor]];
[lblpkr setFont:[UIFont boldSystemFontOfSize:x]];
[lblpkr setText:[NSString stringWithFormat:@"%d",row]];

return lblpkr;}

For Swift

See this for customizable implementation of UIDatePicker

https://github.com/prolificinteractive/PIDatePicker

Answer 3

Actually you can update the font size using method swizzling. This is how I change the font

#import "UILabel+Extra.h"

@implementation UILabel (Extra)

-(void)layoutSubviews{
    [super layoutSubviews];

    NSArray *arrayFont = [self.font.fontName componentsSeparatedByString:@"-"];
    NSArray *arrayRobotoStyleName = [UIFont fontNamesForFamilyName:@"Roboto"];
    __block NSString *style;
    if(arrayFont.count >= 2){
        [arrayRobotoStyleName enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger index, BOOL * _Nonnull stop){
            NSString *styleName = [arrayFont lastObject];
            if ([obj containsString:styleName]){
                style = styleName;
                *stop = TRUE;
            }
            else if (index == ([arrayRobotoStyleName count] - 1)){
                style = @"Regular";
                *stop = TRUE;
            }
        }];
    }
    else
        style = @"Regular";

    if (!style) {
        style = @"Regular";
    }
    self.font = [UIFont fontWithName:[NSString stringWithFormat:@"Roboto-%@",style] size:self.font.pointSize];
}

-(void)setAppearanceFont:(UIFont *)font{
    if (font)
        [self setFont:font];
}

-(UIFont *)appearanceFont{
    return self.font;
}