iOS UIPickerView
2018-08-03 本文已影响694人
本本的开心牧场
- 普通展示
#import "ViewController.h"
@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
@property(nonatomic,strong)UIPickerView *pickerView;
@property(nonatomic,strong)NSArray *dataSouce;
@property (weak, nonatomic) IBOutlet UILabel *label1;
@property (weak, nonatomic) IBOutlet UILabel *label2;
@property (weak, nonatomic) IBOutlet UILabel *label3;
@end
@implementation ViewController
#pragma mark - life cycle
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.pickerView];
// 默认选中数据
// [self pickerView:self.pickerView didSelectRow:0 inComponent:1];
// 每行的默认选中数据
for (int i = 0; i < self.dataSouce.count; ++i) {
[self.pickerView selectRow:1 inComponent:i animated:YES];
[self pickerView:self.pickerView didSelectRow:1 inComponent:i];
}
}
#pragma mark - public methods
#pragma mark - private methods
- (IBAction)random:(id)sender {
// 遍历集合中的所有组
for (int i = 0; i < self.dataSouce.count; ++i) {
// 第i组里面的所有数据
NSUInteger count = [self.dataSouce[i] count];
// 生成随机数去选中
u_int32_t ranNum = arc4random_uniform((int)count);
// 获取第i组当前选中的行
NSInteger selRowNum = [self.pickerView selectedRowInComponent:i];
// 如果随机数与当前选中的行号一致,需要重新生成随机数
while (selRowNum == ranNum) {
ranNum = arc4random_uniform((int)count);
}
// 让pickerView选中数据
[self.pickerView selectRow:ranNum inComponent:i animated:YES];
// 将数据现实到label上
[self pickerView:self.pickerView didSelectRow:ranNum inComponent:i];
}
}
#pragma mark - getter && setter
#pragma mark - lazy loading
- (UIPickerView *)pickerView {
if (!_pickerView) {
_pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 20, self.view.bounds.size.width, 320)];
_pickerView.delegate = self;
_pickerView.dataSource = self;
// _pickerView.showsSelectionIndicator = YES;
}
return _pickerView;
}
- (NSArray *)dataSouce {
if (!_dataSouce) {
// _dataSouce = @[@[@"西瓜",@"西红柿",@"番茄"],@[@"",@"西红柿",@"番茄"],@[@"西瓜",@"西红柿",@"番茄"]];
_dataSouce= [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"01foods.plist" ofType:nil]];
}
return _dataSouce;
}
#pragma mark - dataSouce
//有几行
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return self.dataSouce.count;
}
//行中有几列
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return [self.dataSouce[component] count];
}
//列显示的数据
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger) row forComponent:(NSInteger)component {
return self.dataSouce[component][row];
}
#pragma mark - delegate
// 选中某一组的某一行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSString *selFood = self.dataSouce[component][row];
NSLog(@"%@", selFood);
switch (component) {
case 0:
self.label1.text = selFood;
break;
case 1:
self.label2.text = selFood;
break;
case 2:
self.label3.text = selFood;
break;
default:
break;
}
}
@end
- 二级联动
#import "ViewController.h"
#import "YLModel.h"
@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
@property(nonatomic,strong)UIPickerView *pickerView;
@property(nonatomic,strong)UILabel *leftLabel;
@property(nonatomic,strong)UILabel *rightLabel;
@property(nonatomic,strong)NSArray *dataSouce;
@property(nonatomic,strong)YLModel *selectModel;
@end
@implementation ViewController
#pragma mark - life cycle
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.pickerView];
[self.view addSubview:self.leftLabel];
[self.view addSubview:self.rightLabel];
[self pickerView:self.pickerView didSelectRow:0 inComponent:0];
}
#pragma mark - public methods
#pragma mark - private methods
#pragma mark - getter && setter
#pragma mark - lazy loading
- (UIPickerView *)pickerView {
if (!_pickerView) {
_pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 300)];
_pickerView.delegate = self;
_pickerView.dataSource = self;
// _pickerView.showsSelectionIndicator = YES;
}
return _pickerView;
}
- (NSArray *)dataSouce {
if (!_dataSouce) {
// plist 转 Array
NSArray *dictArr = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"02cities.plist" ofType:nil]];
NSMutableArray *arrM = [NSMutableArray arrayWithCapacity:dictArr.count];
for (NSDictionary *dict in dictArr) {
YLModel *model = [YLModel provinceWithDict:dict];
[arrM addObject:model];
}
_dataSouce = arrM;
}
return _dataSouce;
}
- (UILabel *)leftLabel {
if (!_leftLabel) {
_leftLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 400, 100, 30)];
}
return _leftLabel;
}
- (UILabel *)rightLabel {
if (!_rightLabel) {
_rightLabel = [[UILabel alloc] initWithFrame:CGRectMake(250, 400, 100, 30)];
}
return _rightLabel;
}
#pragma mark - dataSouce
// Components
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 2;
}
//Rows
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
if (0 == component) {
return self.dataSouce.count;
}
else {
// 选中的row在Component中
NSInteger selectRow = [pickerView selectedRowInComponent:0];
YLModel *model = self.dataSouce[selectRow];
// 将新的省数据保存起来
_selectModel = model;
return model.cities.count;
}
}
//title
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (0 == component) {
YLModel *model = self.dataSouce[row];
return model.name;
}
else {
return self.selectModel.cities[row];
}
}
#pragma mark - delegate
//Select
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (component == 0) {
[pickerView reloadComponent:1];
[pickerView selectRow:0 inComponent:1 animated:YES];
}
// return select Row In Component
NSInteger selectProIndex = [pickerView selectedRowInComponent:0];
NSInteger selectCityIndex = [pickerView selectedRowInComponent:1];
YLModel *model = self.dataSouce[selectProIndex];
NSString *cityname = model.cities[selectCityIndex];
self.leftLabel.text = model.name;
self.rightLabel.text = cityname;
}
@end
- 自定义pickerView
#import "ViewController.h"
#import "YLView.h"
@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
@property(nonatomic,strong)UIPickerView *pickerView;
@property(nonatomic,strong)NSArray *dataSouce;
@end
@implementation ViewController
#pragma mark - life cycle
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.pickerView];
}
#pragma mark - public methods
#pragma mark - private methods
#pragma mark - getter && setter
#pragma mark - lazy loading
- (UIPickerView *)pickerView {
if (!_pickerView) {
_pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 170, self.view.bounds.size.width, 320)];
_pickerView.delegate = self;
_pickerView.dataSource = self;
// _pickerView.showsSelectionIndicator = YES;
}
return _pickerView;
}
- (NSArray *)dataSouce {
if (!_dataSouce) {
_dataSouce= @[@"1",@"1",@"1",@"1",@"1",@"1",@"1",@"1"];
}
return _dataSouce;
}
#pragma mark - dataSouce
// Components
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
// row
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return self.dataSouce.count;
}
// custom view for row
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
NSString *imageName = self.dataSouce[row];
YLView *custcomView = [YLView YLView];
// custcomView.frame = CGRectMake(0, 0, self.view.bounds.size.width, 214);
custcomView.imageName = imageName;
return custcomView;
}
//❌❌❌
//- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger) row forComponent:(NSInteger)component {
// return self.dataSouce[component][row];
//}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
return 214;
}
@end
