不管在应用中还是游戏中让用户输入数字都是比较麻烦的，首先需要呼出键盘，其次输入数字，最后确认输入，在这么小的屏幕上步骤如此麻烦，假想，，如果让用户长按按钮实现数值快速增长和快速减小，那多简单啊，好吧，废话不多说，直接上代码，实现比较简单，不做过多解释（如有不当之处，烦请指出，多谢）
//// ViewController.m//// Created by Hunk on 15/2/12.// Copyright (c) 2015年 Hunk. All rights reserved.//#import "ViewController.h"#define STAGE_ONE(20)#define STAGE_TWO(50)#define STAGE_THREE(100)#define MINUS_BTN_TAG (99)#define PLUS_BTN_TAG (101)@interface ViewController (){UILabel *label;NSTimer *timer;NSInteger flag;NSInteger index;}@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];index = 1;flag = 0;label = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 100.0, CGRectGetWidth(self.view.frame) – 100.0, 60.0)];[label setBackgroundColor:[UIColor yellowColor]];[label setFont:[UIFont systemFontOfSize:50.0]];[label setTextAlignment:NSTextAlignmentCenter];[label setText:@(index).stringValue];[self.view addSubview:label];UIButton *minusButton = [UIButton buttonWithType:UIButtonTypeCustom];[minusButton setFrame:CGRectMake(0.0, CGRectGetMinY(label.frame), 50.0, CGRectGetHeight(label.frame))];[minusButton setBackgroundColor:[UIColor redColor]];[minusButton setTitle:@"-" forState:UIControlStateNormal];[minusButton.titleLabel setFont:[UIFont systemFontOfSize:50]];[minusButton addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];[minusButton setTag:MINUS_BTN_TAG];[self.view addSubview:minusButton];UILongPressGestureRecognizer *minusLongPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] init];[minusLongPressGestureRecognizer addTarget:self action:@selector(minusGestureRecognizerAction:)];[minusLongPressGestureRecognizer setMinimumPressDuration:.5f];[minusLongPressGestureRecognizer setAllowableMovement:10.0];[minusButton addGestureRecognizer:minusLongPressGestureRecognizer];UIButton *plusButton = [UIButton buttonWithType:UIButtonTypeCustom];[plusButton setFrame:CGRectMake(CGRectGetWidth(self.view.frame) – 50.0, CGRectGetMinY(label.frame), 50.0, CGRectGetHeight(label.frame))];[plusButton setBackgroundColor:[UIColor greenColor]];[plusButton setTitle:@"+" forState:UIControlStateNormal];[plusButton.titleLabel setFont:[UIFont systemFontOfSize:50]];[plusButton addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];[plusButton setTag:PLUS_BTN_TAG];[self.view addSubview:plusButton];UILongPressGestureRecognizer *plusLongPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] init];[plusLongPressGestureRecognizer addTarget:self action:@selector(plusGestureRecognizerAction:)];[plusLongPressGestureRecognizer setMinimumPressDuration:.5f];[plusLongPressGestureRecognizer setAllowableMovement:10.0];[plusButton addGestureRecognizer:plusLongPressGestureRecognizer];}- (void)buttonAction:(UIButton *)button{if(MINUS_BTN_TAG == [button tag]){index–;if(index < 1){index = 1;}}else if(PLUS_BTN_TAG == [button tag]){index++;}[label setText:@(index).stringValue];}- (void)minusGestureRecognizerAction:(UILongPressGestureRecognizer *)panGestureRecognizer{switch(panGestureRecognizer.state){case UIGestureRecognizerStateBegan:{flag = -1;timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];}break;case UIGestureRecognizerStateChanged:{}break;case UIGestureRecognizerStateEnded:{[timer invalidate];timer = nil;}break;default:break;}}- (void)plusGestureRecognizerAction:(UILongPressGestureRecognizer *)panGestureRecognizer{switch(panGestureRecognizer.state){case UIGestureRecognizerStateBegan:{flag = 1;timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];}break;case UIGestureRecognizerStateChanged:{}break;case UIGestureRecognizerStateEnded:{[timer invalidate];timer = nil;}break;default:break;}}- (void)updateTimer:(NSTimeInterval)dt{if(index > 0 && index < STAGE_ONE){index += (1 * flag);}else if(index >= STAGE_ONE && index < STAGE_TWO){index += (5 * flag);}else if(index >= STAGE_TWO && index < STAGE_THREE){index += (10 * flag);}else{index += (50 * flag);}if(index < 1){index = 1;}[label setText:@(index).stringValue];}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.}@end
失败是成功的亲娘，没有失败哪来的成功呢?诺贝尔如果不经历千万次的失败，
