收集iOS--UIPickerView的常用属性

示例图片

////  RootViewController.m//  UIPickerView////  Created by 林杰 on 16/8/2.//  Copyright © 2016年 TenMios. All rights reserved.//#import "RootViewController.h"@interface RootViewController ()@end

#define SWidth [UIScreen mainScreen].bounds.size.width

#define SHeight [UIScreen mainScreen].bounds.size.height

@implementation RootViewController

- (void)viewDidLoad {

[super viewDidLoad];

//iphone 5  之前 默认高度是216

UIPickerView *pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 100, SWidth, 100) ];

pickerView.backgroundColor = [UIColor grayColor];

pickerView.delegate = self;

pickerView.dataSource = self;

[self.view addSubview: pickerView];

array1  = @[@"福建省",@"广东省",@"山东省",@"湖南省",@"湖北省"];

array2  = @[@"福州",@"广东",@"山东",@"湖南",@"湖北"];

}

#pragma  mark UIPickerViewDataSource 数据源

// 返回的列数

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 2;

}

// 返回的行数

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

if(component == 0)

{

return array1.count;

}else{

return array2.count;

}

}

#pragma  mark UIPickerViewDelegate 委托





// 返回行的内容（自定义） 也可以返回图片内容

-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

{

if(component == 0)

{

UIView *view = [[UIView alloc]init];

view.backgroundColor = [UIColor redColor];

return view ;

}else{

UIView *view2 = [[UIView alloc]init];

view2.backgroundColor = [UIColor blueColor];

return view2 ;

}

}

// 返回每行的内容

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

{

if(component == 0)

{

return array1[row];

}else{

return array2[row];

}

}

//列的高度  (左大右小)

-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component

{

if (component == 0) {

return 200;

}else{

return 100;

}

}

//行的高度

-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

if (component == 0) {

return 50;

}else{

return 50;

}

}

@end








//**************************************************  例子一 ////  RootViewController.m//  UIPickerView////  Created by 林杰 on 16/8/2.//  Copyright © 2016年 TenMios. All rights reserved.//#import "RootViewController.h"@interface RootViewController ()@end

#define SWidth [UIScreen mainScreen].bounds.size.width

#define SHeight [UIScreen mainScreen].bounds.size.height

@implementation RootViewController

- (void)viewDidLoad {

[super viewDidLoad];

//iphone 5  之前 默认高度是216

UIPickerView *pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 100, SWidth, 300) ];

pickerView.backgroundColor = [UIColor grayColor];

pickerView.delegate = self;

pickerView.dataSource = self;

[self.view addSubview: pickerView];

//    array1  = @[@"福建省",@"广东省",@"山东省",@"湖南省",@"湖北省"];

//    array2  = @[@"福州",@"广东",@"山东",@"湖南",@"湖北"];

NSString *path = [[NSBundle mainBundle ] pathForResource:@"area" ofType:@"plist"];

array1 = [NSArray arrayWithContentsOfFile:path];

NSLog(@"%@",array1);

}

#pragma  mark UIPickerViewDataSource 数据源

// 返回的列数

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 2;

}

// 返回的行数

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

if(component == 0)

{

return array1.count;

}else{

// 第一列选中的行数

NSInteger firstSelectRow = [pickerView selectedRowInComponent:0];

//获取省的数据

NSDictionary *dic =array1[firstSelectRow];

//获取城市的数据

NSArray *cityArray = [dic objectForKey:@"areas"];

return cityArray.count;

}

}

#pragma  mark UIPickerViewDelegate 委托

//点击事件

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

// 第一列选中事件

if (component == 0) {

// reloadAllComponent  刷新所有 列数

// 刷新指定的列数的数据  【点击左边 刷新右边 】

[pickerView reloadComponent:1];

// 【让第二列滑到多行】【然后滑动第一列到别行】【让第二列回到第一行第一个位置】

[pickerView selectRow:0 inComponent:1 animated:YES];

}

}

// 返回行的内容（自定义）

//-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

//{

//

//    if(component == 0)

//{

//    UIView *view = [[UIView alloc]init];

//    view.backgroundColor = [UIColor redColor];

//    return view ;

//

//  }else{

//    UIView *view2 = [[UIView alloc]init];

//    view2.backgroundColor = [UIColor blueColor];

//    return view2 ;

//

//

//  }

//}

// 返回每行的内容

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

{

if(component == 0)

{

NSDictionary *dic = [array1 objectAtIndex:row];

return [dic objectForKey:@"state"];

}else{

// 第一列选中的行数

NSInteger firstSelectRow = [pickerView selectedRowInComponent:0];

//获取省的数据

NSDictionary *dic =array1[firstSelectRow];

//获取城市的数据

NSArray *cityArray = [dic objectForKey:@"areas"];

// 防止两个快速滑动时候，数组越界而崩溃的问题

if(row < cityArray.count)

{

return [cityArray objectAtIndex:row];

}else

{

return @"";

}

}

}

//列的高度  (左大右小)

-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component

{

if (component == 0) {

return 200;

}else{

return 100;

}

}

//行的高度

-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

if (component == 0) {

return 50;

}else{

return 50;

}

}

//

//

@end