TextView和textField 定位光标问题

#import "ViewController.h"

@interface ViewController () <UITextViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(40, 40, 400, 500)];
    
    textView.backgroundColor = [UIColor purpleColor];
    textView.font = [UIFont systemFontOfSize:20];
    textView.delegate = self;
    textView.scrollEnabled = NO;
    [self.view addSubview:textView];
   
    
}

- (void)textViewDidChangeSelection:(UITextView *)textView {
    NSLog(@"%ld", textView.selectedRange.location);
}


@end