iOS的UIButton和UILable

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初始化UIButton和UILable对象,然后设置按钮的点击事件监听,改变UILable的值为当前时间;
运行截图:
这里写图片描述

代码如下:

////  ViewController.m//  tableviewdemo04////  Created by vrinux on 15/6/4.//  Copyright (c) 2015年 vrinux. All rights reserved.//#import "ViewController.h"@interface ViewController ()//     定义按钮;@property (nonatomic,strong) UIButton *mButton;//     定义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.//    初始化按钮;    _mButton = [UIButton buttonWithType:UIButtonTypeCustom];//    绘制按钮的尺寸;    _mButton.frame = CGRectMake(100.0f, 100.0f, 200.0f, 100.0f);//    设置背景颜色;    [_mButton setBackgroundColor:[UIColor redColor]];//    设置按钮文字;    [_mButton setTitle:@"点击我吧" forState:UIControlStateNormal];//    设置按钮的点击事件,调用函数 onClick:    [_mButton addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];//    将按钮添加到view上面;    [self.view addSubview:_mButton];//    初始化UILable;    _mLable = [[UILabel alloc] initWithFrame:CGRectMake(100, 350, 200, 100)];//    设置字体大小;    _mLable.font = [UIFont boldSystemFontOfSize:18.0f];//    设置字体对齐方式;    _mLable.textAlignment = NSTextAlignmentCenter;//    设置文字颜色;    _mLable.textColor = [UIColor whiteColor];//    设置背景颜色;    [_mLable setBackgroundColor:[UIColor redColor]];//     将按钮添加到view上面;    [self.view addSubview:_mLable];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}//     设置点击事件调用的方法;- (void)onClick:(id)senser{    _mLable.text = [self getDate];}//     获取当前时间;- (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
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