094设置选择器框行和列尺寸

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController : UIViewController<UIPickerViewDataSource, UIPickerViewDelegate>
4 @end

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 - (void)layoutUI;
 5 @end
 6 
 7 @implementation ViewController
 8 
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11     
12     [self layoutUI];
13 }
14 
15 - (void)didReceiveMemoryWarning {
16     [super didReceiveMemoryWarning];
17     // Dispose of any resources that can be recreated.
18 }
19 
20 - (void)layoutUI {
21     UIPickerView *pikVCustom = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
22     pikVCustom.center = self.view.center;
23     pikVCustom.dataSource = self;
24     pikVCustom.delegate = self;
25     [self.view addSubview:pikVCustom];
26 }
27 
28 #pragma mark - PickerView
29 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
30     return 2; //返回组件列数
31 }
32 
33 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
34     return 10; //返回组件行数
35 }
36 
37 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
38     NSString *strTitle = @"";
39     if (component == 0) {
40         strTitle = [NSString stringWithFormat:@"%2ld", row+1];
41     } else {
42         strTitle = [NSString stringWithFormat:@"比较长的字符串，其中%ld", row+1];
43     }
44     return strTitle;  //返回组件行标题
45 }
46 
47 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
48     return component == 0 ? 40 : 280; //返回组件宽度
49 }
50 
51 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
52     return 40;  //返回组件行高度
53 }
54 
55 @end