将字体大小和样式的部分添加到 pickerView

Question

我制作了一个字体选择器，可以显示轮子内的所有字体。

我现在需要添加 2 个额外的部分来更改字体大小和样式（粗体、斜体、下划线）。

样式和大小是 UIFont 类的成员吗？如果是这样，它们是如何访问的？

这是我正在使用的代码：

.h 文件：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    NSArray *fonts;


    NSMutableArray *fontNames;
    NSArray *fontSize;
    NSArray *fontStyle;

}


@property (strong, nonatomic,retain) IBOutlet UIPickerView *fontPicker;
@property (strong, nonatomic) IBOutlet UILabel *fontLabel;

@end

更新的 .m 文件。这给了我一个选择大小的部分，但它也改变了字体：

#import "ViewController.h"

@interface ViewController ()
{

}

@end

@implementation ViewController

#define MINIMUM_ALLOWED_FONT_SIZE 13

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.



     fontNames = [NSMutableArray array];

    for(NSString *familyName in [UIFont familyNames]) {
        for(NSString *fontName in [UIFont fontNamesForFamilyName:familyName]) {
            [fontNames addObject:fontName];
        }
    }

    _fontPicker.hidden = YES;
}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
    return 2;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{

    if(component == 0)
    {
    return fontNames.count;
    }
    else if (component == 1){
        return MINIMUM_ALLOWED_FONT_SIZE + 17;
    }


    return -1;

}



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


  UILabel *pickerLabel = (UILabel *)view;
    if (component == 0) {

        CGRect frame = CGRectMake(0.0, 0.0, 80, 32);
        pickerLabel = [[UILabel alloc] initWithFrame:frame];
        pickerLabel.backgroundColor = [UIColor clearColor];
        pickerLabel.textAlignment = NSTextAlignmentLeft;
        pickerLabel.text = [NSString stringWithFormat:@"%@",[fontNames objectAtIndex:row]];
        pickerLabel.font = [UIFont fontWithName:[fontNames objectAtIndex:row] size:15];
        return pickerLabel;

    } else if (component == 1) {
        sizeLabel = [[UILabel alloc]initWithFrame:CGRectMake(0,0,80,32)];
         sizeLabel.backgroundColor = [UIColor clearColor];
        sizeLabel.textAlignment = NSTextAlignmentLeft;
        sizeLabel.text = [NSString stringWithFormat:@"%i", (row + MINIMUM_ALLOWED_FONT_SIZE)];
           return sizeLabel;
    }

    return nil;




}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
      inComponent:(NSInteger)component
{


    _fontLabel.text = [fontNames objectAtIndex:row];
    _fontLabel.font = [UIFont fontWithName:[fontNames objectAtIndex:row] size:MINIMUM_ALLOWED_FONT_SIZE];

    if(component == 1)
    {
        _fontLabel.font = [UIFont fontWithName:[fontNames objectAtIndex:row] size:row+MINIMUM_ALLOWED_FONT_SIZE];
    }




}

- (IBAction)operationPressed:(id)sender {

   _fontPicker.hidden = NO;



}


@end

Answer 1

大小是独立的，不依赖于字体。

粗体和斜体取决于字体，并且应该已经包含在您处理字体名称的过程中。

下划线和删除线之类的东西是表示属性，因此不依赖于字体（显式绘制或通过属性字符串绘制）。

---

添加字体大小：

将numberOfComponentsInPickerView 更改为return 2;

将pickerView:viewForRow:forComponent:reusingView: 更改为

if (component == 0) {
    // add the current code you have here
} else {
    // create a new label here
    pickerLabel.text = [NSString stringWithFormat:@"%i", (row + MINIMUM_ALLOWED_FONT_SIZE)];
}

添加#define MINIMUM_ALLOWED_FONT_SIZE 13

附言不要使用[NSString stringWithFormat:@"%@", 如果你已经有一个字符串（你有），那是没有意义的和浪费的。

---

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
  inComponent:(NSInteger)component
{
    _fontLabel.text = [fontNames objectAtIndex:[pickerView selectedRowInComponent:0]];
    _fontLabel.font = [UIFont fontWithName:fontNames objectAtIndex:[pickerView selectedRowInComponent:0]]
                                  size:MINIMUM_ALLOWED_FONT_SIZE + [pickerView selectedRowInComponent:1]];
}