iOS中UILabel的定义及在Auto Layout中的使用 iOS App中UILabel的自定义及在Auto Layout中的使用

#import <UIKit/UIKit.h>
 
@interface myLabel : UILabel
 
@end

#import "myLabel.h"

@implementation myLabel

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"myLabel touch");
}

@end

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor greenColor]];
   
    myLabel *label = [[myLabel alloc] init];
    label.frame = CGRectMake(60, 100, 200, 50);
    label.text = @"Hello world";
    label.backgroundColor = [UIColor blueColor];
   
    label.userInteractionEnabled = YES;
   
    [self.view addSubview:label];
}
 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
 　　NSLog(@"viewController touch");
}

 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
     NSLog(@"myLabel touch");
     [self.nextResponder touchesBegan:touches withEvent:event];  // 接受到事件后继续向上传递事件
 }