//宏定义
#define YLSRect(x, y, w, h) CGRectMake([UIScreen mainScreen].bounds.size.width * x, [UIScreen mainScreen].bounds.size.height * y, [UIScreen mainScreen].bounds.size.width * w, [UIScreen mainScreen].bounds.size.height * h)
@interface ViewController ()<UITextFieldDelegate>
//声明
/** text1 */
@property (nonatomic,strong) UITextField *text1;
/** text2 */
@property (nonatomic,strong) UITextField *text2;
/** text3 */
@property (nonatomic,strong) UITextField *text3;
@end
 - (void)viewDidLoad {
 [super viewDidLoad];
 self.title = @"Picker";
 //placeholder数组
 NSArray *placeholderArr = @[@"Picker OneVlaue",@"Picker TwoVlaue",@"Picker ThreeVlaue"];
 //循环添加文本框
 for (int i = 0; i < 3; i ++)
 {
  UITextField *text = [[UITextField alloc]initWithFrame:YLSRect(100/375, (140 + i * 60)/667, 175/375, 30/667)];
  text.borderStyle = UITextBorderStyleRoundedRect;
  text.backgroundColor = [UIColor lightGrayColor];
  text.tag = i + 1000;
  text.placeholder = placeholderArr[i];
  text.delegate = self;
  [self.view addSubview:text];
  if(text.tag == 1000)
  {
   self.text1 = text;
  }else if(text.tag == 1001)
  {
   self.text2 = text;
  }else
  {
   self.text3 = text;
  }
 } 
} 

//点击文本框时触发的事件
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField;

@interface YLSOPickerView : UIView
/** array */
@property (nonatomic,strong) NSArray *array;
/** title */
@property (nonatomic,strong) NSString *title;
//快速创建
+(instancetype)pickerView;
//弹出
-(void)show;
@end

#define YLSRect(x, y, w, h) CGRectMake([UIScreen mainScreen].bounds.size.width * x, [UIScreen mainScreen].bounds.size.height * y, [UIScreen mainScreen].bounds.size.width * w, [UIScreen mainScreen].bounds.size.height * h)
#define YLSFont(f) [UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width * f]
#define YLSColorAlpha(r,g,b,a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:(a)]
#define YLSMainBackColor [UIColor colorWithRed:240/255.0 green:239/255.0 blue:245/255.0 alpha:1]
#define BlueColor [UIColor colorWithRed:0/255.0 green:122/255.0 blue:255/255.0 alpha:1]
#define ClearColor [UIColor clearColor]

@interface YLSOPickerView()<UIPickerViewDelegate,UIPickerViewDataSource>
/** view */
@property (nonatomic,strong) UIView *topView;
/** button */
@property (nonatomic,strong) UIButton *doneBtn;
/** pickerView */
@property (nonatomic,strong) UIPickerView *pickerView;
/** 选择传回的值 */
@property (nonatomic,strong) NSString *result;
@end

//快速创建
+ (instancetype)pickerView
{
 return [[self alloc]init];
}
-(instancetype)initWithFrame:(CGRect)frame
{
 self = [super initWithFrame:YLSRect(0, 0, 1, 917/667)];
 if (self)
 {
  self.backgroundColor = YLSColorAlpha(0, 0, 0, 0.4); 
 }
 return self;
}

-(void)layoutSubviews
{
 [super layoutSubviews];
 self.topView = [[UIView alloc]initWithFrame:YLSRect(0, 667/667, 1, 250/667)];
 self.topView.backgroundColor = [UIColor whiteColor];
 [self addSubview:self.topView];
 //为view上面的两个角做成圆角。不喜欢的可以注掉
 UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.topView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(5, 5)];
 CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
 maskLayer.frame = self.topView.bounds;
 maskLayer.path = maskPath.CGPath;
 self.topView.layer.mask = maskLayer;
 self.doneBtn = [UIButton buttonWithType:UIButtonTypeCustom];
 [self.doneBtn setTitle:@"Done" forState:UIControlStateNormal];
 [self.doneBtn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
 [self.doneBtn setFrame:YLSRect(320/375, 5/667, 50/375, 40/667)];
 [self.doneBtn addTarget:self action:@selector(quit) forControlEvents:UIControlEventTouchUpInside];
 [self.topView addSubview:self.doneBtn];
 UILabel *titlelb = [[UILabel alloc]initWithFrame:YLSRect(100/375, 0, 175/375, 50/667)];
 titlelb.backgroundColor = ClearColor;
 titlelb.textAlignment = NSTextAlignmentCenter;
 titlelb.text = self.title;
 titlelb.font = YLSFont(20/375);
 [self.topView addSubview:titlelb];
 self.pickerView = [[UIPickerView alloc]init];
 [self.pickerView setFrame:YLSRect(0, 50/667, 1, 200/667)];
 [self.pickerView setBackgroundColor:YLSMainBackColor];
 [self.pickerView setDelegate:self];
 [self.pickerView setDataSource:self];
 [self.pickerView selectRow:0 inComponent:0 animated:YES];
 [self.topView addSubview:self.pickerView];
}

<UIPickerViewDelegate,UIPickerViewDataSource>
// 返回选择器有几列.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
 return 1;
}
// 返回每组有几行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
 return [self.array count];
}
#pragma mark - 代理
// 返回第component列第row行的内容（标题）
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
 return self.array[row];
}
// 选中第component第row的时候调用
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
 self.result = self.array[row];
}

//弹出
- (void)show
{
 [self showInView:[UIApplication sharedApplication].keyWindow];
}
//添加弹出移除的动画效果
- (void)showInView:(UIView *)view
{
 // 浮现
 [UIView animateWithDuration:0.5 animations:^{
  CGPoint point = self.center;
  point.y -= 250;
  self.center = point;
 } completion:^(BOOL finished) { 
 }];
 [view addSubview:self];
}

-(void)quit
{
 [UIView animateWithDuration:0.5 animations:^{
  self.alpha = 0;
  CGPoint point = self.center;
  point.y += 250;
  self.center = point;
 } completion:^(BOOL finished) {
  if (!self.result) {
   self.result = self.array[0];
  }
  NSLog(@"%@",self.result);
  [[NSNotificationCenter defaultCenter]postNotificationName:@"value" object:self.result];
  [self removeFromSuperview];
 }];
}

#pragma mark - UITextFieldDelegate
//点击文本框时触发的事件，唤起跳出视图
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
 if(textField.tag == 1000)
 {
  YLSOPickerView *picker = [[YLSOPickerView alloc]init];
  picker.array = @[@"iPhone4",@"iPhone4S",@"iPhone5",@"iPhone5S",@"iPhone5C",@"iPhone6",@"iPhone6Plus",@"iPhone6S",@"iPhone6SPlus"];
  picker.title = @"pick number";
  [picker show];
 }
 return NO;
}

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(getValue:) name:@"value" object:nil];
-(void)getValue:(NSNotification *)notification
{
 self.text1.text = notification.object;
}

self.ranBtn = [UIButton buttonWithType:UIButtonTypeCustom];
 [self.ranBtn setTitle:@"Random" forState:UIControlStateNormal];
 [self.ranBtn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
 [self.ranBtn setFrame:YLSRect(5/375, 5/667, 100/375, 40/667)];
 [self.ranBtn addTarget:self action:@selector(random:) forControlEvents:UIControlEventTouchUpInside];
 [self.topView addSubview:self.ranBtn];

-(void)random:(UIPickerView *)picker
{
 for (int i = 0; i < 3; i++)
 {
  // 取出第i列的行数
  NSInteger count = [self.array[i] count];
  int random = arc4random_uniform((u_int32_t)count);
  //不会触发代理的选中方法
  [self.pickerView selectRow:random inComponent:i animated:YES];
  //label数据刷新
  [self pickerView:picker didSelectRow:random inComponent:i];
 }
}