简单的介绍一下UIPickerView，下面以单个选择器举例。
#import "ViewController.h"
//设置UIPickerView的协议
@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
@property(nonatomic,strong) UIPickerView *pickerView;
@property(nonatomic,strong) NSArray *testArr;
@property(nonatomic,strong) UILabel *textLabel;
@end
@implementation ViewController
-(NSArray *)testArr {
if (!_testArr) {
_testArr = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16",@"17",@"18",@"19",@"20",@"21",@"22",@"23",@"24",@"25"];
}
return _testArr;
}
- (void)viewDidLoad {
[super viewDidLoad];
//显示指定项的内容
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake((self.view.bounds.size.width - 200)/2, 100, 200, 40)];
self.textLabel = label;
[self.view addSubview:label];
//弹出选择器
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
button.frame = CGRectMake((self.view.bounds.size.width - 100)/2, 200, 100, 40);
button.backgroundColor = [UIColor redColor];
[button setTitle:@"hehe" forState:UIControlStateNormal];
[button addTarget:self action:@selector(clickingButton) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)clickingButton {
UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(20, self.view.bounds.size.height - 250, self.view.bounds.size.width - 40, 250)];
self.pickerView = pickerView;
pickerView.showsSelectionIndicator = YES;
pickerView.dataSource = self;
pickerView.delegate = self;
[self.view addSubview:pickerView];
}
//设定选择器的个数
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
//指定每个选择器中选项数
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return self.testArr.count;
}
//指定每个选项的内容
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
NSString *str = self.testArr[row];
return str;
}
//选定指定项之后的操作
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
self.textLabel.text = self.testArr[row];
[self.pickerView removeFromSuperview];
}
@end