如何使用Objective-C在自定义视图中绘制文本？

#import <UIKit/UIKit.h>

@interface CustomView : UIView
@end

@implementation CustomView

- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];

    // 在此处绘制文本
}

@end

NSString *text = @"Hello, World!";
UIFont *font = [UIFont systemFontOfSize:24];
NSDictionary *attributes = @{NSFontAttributeName: font};
NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:attributes];

CGRect textRect = CGRectMake(20, 20, 200, 50);
[attributedText drawInRect:textRect];

CustomView *customView = [[CustomView alloc] initWithFrame:CGRectMake(0, 0, 300, 100)];
[self.view addSubview:customView];