Button與Label的聯結（三）

測試動態button傳遞變數的方法

1. 開啓專案

2. 在mainViewController.h設定Label變數
#import <UIKit/UIKit.h>

@interface mainViewController : UIViewController

@property (nonatomic) UILabel *helloLabel;

@end



3. 在mainViewController.m加入動態Button的程式碼
#import "mainViewController.h"

@interface mainViewController ()

@end

@implementation mainViewController

@synthesize  helloLabel;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   
    [self setButton:1];
    [self setButton:2];
   
    [self setLabel];
   
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)setLabel {
   
    helloLabel = [[UILabel alloc] init];
   
    helloLabel.frame = CGRectMake(200, 100 ,200, 100);
   
    //helloLabel.center = self.view.center;
   
    helloLabel.backgroundColor = [UIColor blueColor];
   
    helloLabel.textAlignment = UITextAlignmentCenter;
   
    helloLabel.text =@"Label";
   
    [self.view addSubview:helloLabel];
}



- (void)setButton:(int) tag
{
    UIButton *_helloActionButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
   
    _helloActionButton.frame = CGRectMake(0,0, 100, 30);
   
    //_helloActionButton.center = self.view.center;
   
    [_helloActionButton setCenter:CGPointMake(100, 50 + tag*150)];
   
    _helloActionButton.tag = tag;
   
    [_helloActionButton addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
   
    //_helloActionButton.= @"Action Button";
    [_helloActionButton setTitle:[NSString stringWithFormat:@"Button%d",tag] forState:UIControlStateNormal];
   
    [self.view addSubview:_helloActionButton];
   
   
}

-(void) buttonPressed : (id) sender{
    UIButton *clicked = (UIButton *) sender;
    helloLabel.text =[NSString stringWithFormat:@"Button%d Pressed",clicked.tag];
}

@end



4. 結果