iOS的UIButton和UILable

iOS的UIButton和UILable

初始化UIButton和UILable對象，然後設定按鈕的點擊事件監聽，改變UILable的值為目前時間；
運行：

代碼如下：

////  ViewController.m//  tableviewdemo04////  Created by vrinux on 15/6/4.//  Copyright (c) 2015年 vrinux. All rights reserved.//#import "ViewController.h"@interface ViewController ()//     定義按鈕；@property (nonatomic,strong) UIButton *mButton;//     定義Label；@property (nonatomic,strong) UILabel *mLable;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.//    初始化按鈕；    _mButton = [UIButton buttonWithType:UIButtonTypeCustom];//    繪製按鈕的尺寸；    _mButton.frame = CGRectMake(100.0f, 100.0f, 200.0f, 100.0f);//    設定背景顏色；    [_mButton setBackgroundColor:[UIColor redColor]];//    設定按鈕文字；    [_mButton setTitle:@"點擊我吧" forState:UIControlStateNormal];//    設定按鈕的點擊事件，調用函數 onClick:    [_mButton addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];//    將按鈕添加到view上面；    [self.view addSubview:_mButton];//    初始化UILable;    _mLable = [[UILabel alloc] initWithFrame:CGRectMake(100, 350, 200, 100)];//    設定字型大小；    _mLable.font = [UIFont boldSystemFontOfSize:18.0f];//    設定字型對齊；    _mLable.textAlignment = NSTextAlignmentCenter;//    設定文字顏色；    _mLable.textColor = [UIColor whiteColor];//    設定背景顏色；    [_mLable setBackgroundColor:[UIColor redColor]];//     將按鈕添加到view上面；    [self.view addSubview:_mLable];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}//     設定點擊事件調用的方法；- (void)onClick:(id)senser{    _mLable.text = [self getDate];}//     擷取目前時間；- (NSString *)getDate{     NSDate *  senddate=[NSDate date];     NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];     [dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];     NSString *  locationString=[dateformatter stringFromDate:senddate];    return locationString;}@end