iOS之自定义pickerview（行驶里程数）

 1 #pragma mark -- 里程数按钮的点击事件
 2 
 3 - (void)mileageBtnClicked:(UIButton *)sender {
 4 
 5     UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"里程数/km







" message:nil preferredStyle:UIAlertControllerStyleAlert];
 6 
 7     UIPickerView *mileage = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 40, 270, 150)];
 8 
 9     //指定Delegate
10 
11     mileage.delegate = self;
12 
13     //显示选中框
14 
15     mileage.showsSelectionIndicator = YES;
16 
17     [alert.view addSubview:mileage];
18 
19     
20 
21     UIAlertAction *ok = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
22 
23         NSInteger row = [mileage selectedRowInComponent:0];
24 
25         NSString *mileageNum = [pickerData objectAtIndex:row];
26 
27         mileageLabel.text = [NSString stringWithFormat:@"%@km", mileageNum];
28 
29     }];
30 
31     
32 
33     UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
34 
35     }];
36 
37     
38 
39     [alert addAction:ok];
40 
41     [alert addAction:cancel];
42 
43     [self presentViewController:alert animated:YES completion:^{ }];
44 
45     
46 
47     pickerData = [[NSArray alloc] initWithObjects:@"3000",@"3500",@"8000",@"8500",@"13000",@"13500",@"18000",@"18500",@"23000",@"23500",@"28500",@"33000",@"33500",@"38000",@"38500",@"43000",@"43500",@"48000",@"48500",@"53000",@"53500",@"58000",@"58500", nil];
48 
49 }
50 
51  #pragma mark -- UIPickerViewDataSource
52 
53 //返回显示的列数
54 
55 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
56 
57     return 1;
58 
59 }
60 
61 //返回显示的行数
62 
63 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
64 
65     return pickerData.count;
66 
67 }
68 
69 #pragma mark -- UIPickerViewDelegate
70 
71 //返回当前行的内容
72 
73 - (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component __TVOS_PROHIBITED {
74 
75     return [pickerData objectAtIndex:row];
76 
77 }
78 
79