將字體大小和樣式的部分添加到pickerView

Question

我製作了一個字體選擇器，可以顯示輪子內的所有字體。

我現在需要添加2個額外的部分來改變字體大小和樣式（粗體，斜體，下劃線）。

是UIFont類的樣式和大小成員？如果是這樣，他們如何訪問？

這裏是我使用的代碼：

.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。這給我一個選擇大小的部分，但它也改變字體：

#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

大小是分開的，不依賴於字體。

粗體和斜體都依賴於字體，並且應該已經被處理字體名稱所覆蓋。

像下劃線和穿透的東西是表示屬性，所以不依賴於字體（顯式或通過屬性字符串）。

---

要添加字體大小：

變化numberOfComponentsInPickerView到return 2;

變化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：如果你已經有一個字符串（你這樣做），不要使用[NSString stringWithFormat:@"%@",，這是毫無意義和浪費的。

---

-(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]]; 
}