可以触发点击事件并变色的UILabel

谁说UILabel不能够当做button处理点击事件呢？今天，笔者就像大家提供一个改造过的，能够触发点击事件并变色的UILabel：）

效果图：

还能当做计时器用囧：

源码如下：

TapLabel.h 与 TapLabel.m

////  TapLabel.h//  TapLabel////  Copyright (c) 2014年 Y.X. All rights reserved.//#import 
     
      @class TapLabel;@protocol TapLabelDelegate 
      
       - (void)tapLabelEvent:(TapLabel *)label;@end@interface TapLabel : UILabel@property (nonatomic, assign) id
       
          delegate;         // 协议@property (nonatomic, strong) NSString             *notificationName; // 设置通知中心名字@property (nonatomic, strong) NSDictionary         *metaData;         // 元数据@end
       
      
     

////  TapLabel.m//  TapLabel////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "TapLabel.h"@implementation TapLabel- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self)    {        self.userInteractionEnabled       = YES;        UILongPressGestureRecognizer *tap = \        [[UILongPressGestureRecognizer alloc] initWithTarget:self                                                      action:@selector(labelEvent:)];        tap.minimumPressDuration          = 0.01f;        [self addGestureRecognizer:tap];    }    return self;}- (void)labelEvent:(UILongPressGestureRecognizer *)gesture{    // 获取到坐标值    CGPoint locationPoint = [gesture locationInView:self];        // 状态1    if (gesture.state == UIGestureRecognizerStateBegan)    {        self.highlighted = YES;    }        // 状态2    if(gesture.state == UIGestureRecognizerStateChanged)    {        if (locationPoint.x <= self.bounds.size.width && locationPoint.x >= 0 &&            locationPoint.y <= self.bounds.size.height && locationPoint.y >= 0)        {            self.highlighted = YES;        }        else        {            self.highlighted = NO;        }    }        // 状态3    if (gesture.state == UIGestureRecognizerStateEnded)    {        if (locationPoint.x <= self.bounds.size.width && locationPoint.x >= 0 &&            locationPoint.y <= self.bounds.size.height && locationPoint.y >= 0)        {                        if (_delegate) {                [_delegate tapLabelEvent:self];            }                        if (_notificationName) {                [[NSNotificationCenter defaultCenter] postNotificationName:_notificationName                                                                    object:nil                                                                  userInfo:@{
    @"TapLabel": self}];            }        }                self.highlighted = NO;    }}@end

使用时的源码：

////  RootViewController.m//  TapLabel////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "RootViewController.h"#import "TapLabel.h"@interface RootViewController ()
     
      @end@implementation RootViewController- (void)viewDidLoad{    [super viewDidLoad];    TapLabel *tap            = [[TapLabel alloc] initWithFrame:CGRectMake(0, 0, 320, 20)];    tap.textAlignment        = NSTextAlignmentCenter;    tap.center               = self.view.center;    tap.text                 = @"YouXianMing";    tap.font                 = [UIFont fontWithName:@"HelveticaNeue-Thin" size:18];    tap.delegate             = self;    tap.metaData             = @{
   @"name": @"YouXianMing"};        tap.highlightedTextColor = [UIColor redColor];    [self.view addSubview:tap];}- (void)tapLabelEvent:(TapLabel *)label{    NSLog(@"%@", label.metaData);}@end
     

原理解析：

1. 在初始化的时候后添加了手势处理：

2. 精确计算手势的3种状态

3. UILabel自带了highlightedTextColor：）

原理就是这么简单呢：）