ios – 更改字体大小以适合UITextView

我在Storyboard中设置了UITextView.它设置为定义的大小.我希望能够根据文本的大小来更改字体的大小.用户无法编辑文本视图,只需更新一次.知道怎么做吗？ 只有UITextField(单行输入)具有adjustsFontSizeToFitWidth和minimumFontSize属性.使用UITextView,您必须自己编程.

static const CGFloat MAX_FONT_SIZE = 16.0;
static const CGFloat MIN_FONT_SIZE = 4.0;

@interface MyViewController ()

// I haven't dealt with Storyboard / Interface builder in years,
// so this is my guess on how you link the GUI to code
@property(nonatomic, strong) IBOutlet UITextView* textView;

- (void)textDidChange:(UITextView*)textView;

@end

@implementation MyViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.textView addTarget:self action:@selector(textDidChange:) forControlEvents:UIControlEventEditingChanged];
    self.textView.font = [UIFont systemFontOfSize:MAX_FONT_SIZE];
}

- (void)textDidChange:(UITextView*)textView
{
    // You need to adjust this sizing algorithm to your needs.
    // The following is oversimplistic.
    self.textView.font = [UIFont systemFontOfSize:MAX(
        MAX_FONT_SIZE - textView.text.length, 
        MIN_FONT_SIZE
    )];
}

@end