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个额外的部分来改变字体大小和样式（粗体，斜体，下划线）。

是UIFont类的样式和大小成员？如果是这样，他们如何访问？

这里是我使用的代码：

.h文件中：

#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。这给我一个选择大小的部分，但它也改变字体：

#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

大小是分开的，不依赖于字体。

粗体和斜体都依赖于字体，并且应该已经被处理字体名称所覆盖。

像下划线和穿透的东西是表示属性，所以不依赖于字体（显式或通过属性字符串）。

---

要添加字体大小：

变化numberOfComponentsInPickerView到return 2;

变化pickerView:viewForRow:forComponent:reusingView:到

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：如果你已经有一个字符串（你这样做），不要使用[NSString stringWithFormat:@"%@",，这是毫无意义和浪费的。

---

-(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]]; 
}