一、简介
//
<<UIPickerView是一个选择器控件，它比较UIDatePicker更加通用，它可生成单列的选择器，也只是很成多排的选择器，而且开发者完全可由定义选择项之外观，因此用法非常灵活
// ViewController.m
<<继承关系：UIPickerView –>
UIView –>UIResponder–>NSObject
// UIPickerViewAll
<<UIPickerView直接继承了UIView，没有继承UIControl，因此，它不可知像UIControl那样绑定事件处理方法，UIPickerView的事件处理由该委托对象就。使用UIPickerView的对象应该遵守UIPickerViewDataSource,UIPickerViewDelegate。
#import “ViewController.h”
格式为
1–> 设置数据源（性能的意图）
@interface ViewController ()
[pickerView setDelegate:self]; （立马是切实的例证）
@property(nullable,nonatomic,weak) id dataSource;//
设置数据源， 默认是空的 （立即是性质的辨证）
@end
次、UIPickerView的特性(属性的相继和苹果API一致)
1–>设置数据源
@implementation ViewController
[pickerView setDelegate:self];
/*
@property(nullable,nonatomic,weak) id dataSource;//
设置数据源， 默认是拖欠的,弱引用
UIPickView控件常用之艺术与性：
2–>设置代理
(1) – (NSInteger)numberOfComponentsInPickerView:(UIPickerView
*)pickerView; 返回PickerView的列数
[pickerView setDelegate:self];
(2) – (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component;
@property(nullable,nonatomic,weak) id delegate;
//设置代理， 默认是空的,弱引用
返回PickView的component列对应的行数
3–>设置是否显示UIPickerView中之当选标记，在iOS7从此这特性没有另外作用
(3) – (nullable NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component;
pickerView.showsSelectionIndicator =YES;
返回各国一样列每一行的内容
@property(nonatomic) BOOL showsSelectionIndicator; // 默认是
NO。该属性决定是否显示UIPickerView中的入选标记（以高亮背景作为入选标记）
(4) – (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component;
4–>获取UIPickerView指定列中涵盖的列表项的数
用户选中PickView的某部平列和有同实施时见面调用该方法
NSInteger row1 =pickerView.numberOfComponents; //获取组键数(列数)
(5) – (nullable NSAttributedString *)pickerView:(UIPickerView
*)pickerView attributedTitleForRow:(NSInteger)row
forComponent:(NSInteger)component
@property(nonatomic,readonly) NSInteger
numberOfComponents; /从数据源和信托获取并缓存的音讯
修改PickView中component列row行的文件的体裁
其三、UIPickerView的性能方法
(6) – (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row forComponent:(NSInteger)component
reusingView:(nullable UIView *)view
该方法返回的UIView的控件将一直作为UIPickView对应的component
列row行的列表项
1–>获取UIPickerView包含的排列数量
(7) – (CGFloat)pickerView:(UIPickerView *)pickerView
rowHeightForComponent:(NSInteger)component 设置component列对应之行高
NSInteger row2 = [pickerView
numberOfRowsInComponent:1];//获取对象下标组键(列数)的行数
(8) – (CGFloat)pickerView:(UIPickerView *)pickerView
widthForComponent:(NSInteger)component
– (NSInteger)numberOfRowsInComponent:(NSInteger)component;
该办法设置component列对应之肥瘦
2–> 获取UIPickerView包含的指定列着列表项的轻重缓急。该办法返回一个CGSize对象。
(9) – (void)selectRow:(NSInteger)row inComponent:(NSInteger)component
animated:(BOOL)animated
NSLog(@”%@”, NSStringFromCGSize(
[self.pickerView rowSizeForComponent:0])); //打印获取之每列的size;
该方法设置选中的UIPickView
第component列row行项，最后一个参数animated代表是否要用到动画
– (CGSize)rowSizeForComponent:(NSInteger)component;
(10) @property(nonatomic,readonly) NSInteger numberOfComponents;
3–> 返回该UIPickerView指定列的列表项所祭的UIView控件。
获取UIPickerView指定列中含有的列表项的数额，该属性是只有念的
UIView *pickview=[self.pickerView viewForRow:0 forComponent:0];
*/
– (nullable UIView *)viewForRow:(NSInteger)row
forComponent:(NSInteger)component;//返回视图提供的委托通过pickerView:viewForRow:forComponent:reusingView:
如果实行或零部件不可见或委托没有落实pickerView:viewForRow:forComponent:reusingView，则也nil
//简单实用
4–> 重载所有分区
//- (void)viewDidLoad
[pickerView reloadAllComponents];//刷新UIPickerView
//{
– (void)reloadAllComponents;
// [super viewDidLoad];
5–> 重载某平等分区
//
[pickerView reloadComponent:1];//刷新有同列的多少
// //获取需要展示的数据
– (void)reloadComponent:(NSInteger)component;
// [self loadData];
6–> 设置选中该UIPickerView中指定列的特定列表项
//
[pickerView pickerView selectRow:2 inComponent:0animated:YES]; //设置选中的第几排第几行 ,程序一样开始运行时虽入选该列该行
// // 初始化pickerView
– (void)selectRow:(NSInteger)row inComponent:(NSInteger)component
animated:(BOOL)animated; //
将指定的行滚动到基本。该办法设置选中该UIPickerView中指定列的特定列表项。最后一个参数控制是否使用动画片。
// self.pickerView = [[UIPickerView
alloc]initWithFrame:CGRectMake(0, 50, self.view.bounds.size.width,
200)];
7–> 返回该UIPickerView指定列中让入选的列表项。
// [self.view addSubview:self.pickerView];
self.row = [self.pickerView
selectedRowInComponent:0];//获取给入选的率先列的行数(这里是为着在叫老二排赋值时用底,因此在此之前要清理代理方的推行各个,以免导致不必要之bug)
//
– (NSInteger)selectedRowInComponent:(NSInteger)component;
//返回选定行。如果没有入选返回-1
// //指定数据源和嘱托
四、UIPickerView的UIPickerViewDataSource
// self.pickerView.delegate = self;
须兑现的不二法门
// self.pickerView.dataSource = self;
1–>返回显示的列数
//}
– (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView
//#pragma mark 加载数据
{
//-(void)loadData
return1;// 返回1标志该控件只包含1列
//{
}
// //需要出示的数目因数组的花样保留
– (NSInteger)numberOfComponentsInPickerView:(UIPickerView
*)pickerView;//UIPickerViewDataSource中定义之道，该方法的返回值决定该控件包含的列数
// self.letter = @[@”aaa”,@”bbb”,@”ccc”,@”ddd”];
2–>显示每组键(列数)的行数
// self.number = @[@”111″,@”222″,@”333″,@”444″];
//指定每个表盘上发生几实践数据
//}
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
//
{
//#pragma mark UIPickerView DataSource Method 数据源方法
NSInteger result = 0;
//
switch (component) {
////指定pickerview有几乎独表盘
case 0:
//-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
result = self.letter.count;//根据数组的因素个数返回几推行数据
//{
break;
// return 2;//第一个显示字母、第二单亮数字
case 1:
//}
result = self.number.count;
//
break;
////指定每个表盘上发出几乎执数据
default:
//-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
break;
//{
}
// NSInteger result = 0;
return result;
// switch (component) {
}
// case 0:
– (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component;
//指定每个表盘上有几乎实行数据
// result =
self.letter.count;//根据数组的要素个数返回几实施数据
五、UIPickerView的UIPickerViewDelegate
// break;
可选方法
// case 1:
1–>返回每列的幅度
// result = self.number.count;
– (CGFloat)pickerView:(UIPickerView *)pickerView
widthForComponent:(NSInteger)component{
// break;
if (component ==0) {
//
return 100;//第一组键(列)的宽
// default:
}else{
// break;
return 100;//第二组键(列)的涨幅
// }
}
//
}
// return result;
– (CGFloat)pickerView:(UIPickerView *)pickerView
widthForComponent:(NSInteger)component
__TVOS_PROHIBITED;//该法返回的CGFloat值将用作该UIPickerView控件中指定列的宽度
//}
2–>返回每列的冲天
//
– (CGFloat)pickerView:(UIPickerView *)pickerView
rowHeightForComponent:(NSInteger)component{
//#pragma mark UIPickerView Delegate Method 代理方
if (component ==0) {
//
return 100;//第一组键(列)的莫大
////指定每行如何展示数据（此处和tableview类似）
}else{
//-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component
return 100;//第二组键(列)的高度
//{
}
// NSString * title = nil;
}
// switch (component) {
– (CGFloat)pickerView:(UIPickerView *)pickerView
rowHeightForComponent:(NSInteger)component
__TVOS_PROHIBITED;//该办法返回的CGFloat值将当该UIPickerView控件中指定列被列表项的冲天。
// case 0:
3–>设置有同实行显示的题目
// title = self.letter[row];
– (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component{
// break;
if (component ==0) {
// case 1:
return [self.content[row]objectForKey:@”State”];//返回省的名号
// title = self.number[row];
}else{
// break;
//下面俩行代码是获取plist文件中城市的称呼
// default:
NSArray *cities = [self.content[self.row]objectForKey:@”Cities”];
// break;
NSString *city =[cities[row] objectForKey:@”city”];
// }
return city;
//
}
// return title;
}
//}
– (nullable NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component
__TVOS_PROHIBITED;//该办法返回的UIView控件将一直作为该UIPickerView控件中指定列的指定列表项。
#pragma mark 两独联动
4–>通过属性字符串设置有一样执行显示的题
– (void)viewDidLoad
– (NSAttributedString *)pickerView:(UIPickerView *)pickerView
attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component{
{
NSString *str = [_nameArray objectAtIndex:row];
[super viewDidLoad];
NSMutableAttributedString *AttributedString =
[[NSMutableAttributedStringalloc]initWithString:str];
[AttributedString addAttributes:@{NSFontAttributeName:[UIFontboldSystemFontOfSize:18], NSForegroundColorAttributeName:[UIColor whiteColor]}range:NSMakeRange(0,
[AttributedString length])];
//加载数据
return AttributedString;
[self loadData];
}
– (nullable NSAttributedString *)pickerView:(UIPickerView
*)pickerView attributedTitleForRow:(NSInteger)row
forComponent:(NSInteger)component NS_AVAILABLE_IOS(6_0)
__TVOS_PROHIBITED;
//指定委托
<注意>如果上述两只艺术还实现了，优先实现attributedTitleForRow的法门
self.pickerView.delegate = self;
5–>设置有一样推行显示的view视图
self.pickerView.dataSource = self;
//可以用UILabel 来设置字体大小 和背景颜色 是一个足以由定义设置的艺术
}
– (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row forComponent:(NSInteger)component
reusingView:(nullable UIView*)view{
UILabel *label;//声明一个UILabel
//加载数据
if (component == 0) {//当是率先推行
-(void)loadData
//设置frame
{
label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
NSString * path = [[NSBundle mainBundle]pathForResource:@”area”
ofType:@”plist”];
//将省名赋给label.text
self.provinces = [NSArray arrayWithContentsOfFile:path];
label.text = [self.content[row]objectForKey:@”State”];
self.cities = [NSArray
arrayWithArray:self.provinces[0][@”Cities”]];
//改变字体的颜料
label.textColor = [UIColor yellowColor];
//label的布局约束
//设置字体大小
self.label = [[UILabel alloc]initWithFrame:CGRectZero];
label.font = [UIFont systemFontOfSize:20];//用label来安装字体大小
self.label.translatesAutoresizingMaskIntoConstraints = NO;
//改变背景的颜色
self.label.backgroundColor = [UIColor
groupTableViewBackgroundColor];
label.backgroundColor = [UIColor redColor];
self.label.textColor = [UIColor greenColor];
}else if (component == 1){//当是第二实行时
self.label.font = [UIFont systemFontOfSize:30];
label =
[[UILabel alloc] initWithFrame:CGRectMake(100, 0, 100, 50)];
[self.label setTextAlignment:NSTextAlignmentCenter];
NSArray *cities = [self.content[self.row]objectForKey:@”Cities”];
[self.view addSubview:self.label];
NSString *city =[cities[row] objectForKey:@”city”];
NSArray * labelTop = [NSLayoutConstraint
constraintsWithVisualFormat:@”V:[_pickerView]-30-[_label(50)]”
options:0 metrics:nil
views:NSDictionaryOfVariableBindings(_pickerView,_label)];
label.text = city ;//将城市名称予以给label.text
NSArray * labelH = [NSLayoutConstraint
constraintsWithVisualFormat:@”H:|-20-[_label]-20-|” options:0
metrics:nil views:NSDictionaryOfVariableBindings(_label)];
label.textColor = [UIColor purpleColor];
[self.view addConstraints:labelTop];
label.font = [UIFont systemFontOfSize:20];
[self.view addConstraints:labelH];
label.backgroundColor = [UIColor redColor];
}
}
return label;
//有几乎单表盘（component）
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
– (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row forComponent:(NSInteger)component
reusingView:(nullable UIView *)view
__TVOS_PROHIBITED;//当用户单击选中该UIPickerView控件的指定列的指定列表项时以会见激起该方式。
{
6–>选中某平推行时实行的回调
return 2;
//被选中的第几排列 的 第几实践
}
– (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
if(component ==0){
//没个表盘有几执数据（rows）
//刷新对应列
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
[self.pickerView reloadComponent:1];
{
//当选择第一列时 第二列切到第一推行
NSInteger rows = 0;
[self.pickerView selectRow:0inComponent:component+1 animated:YES];
switch (component) {
}
case 0:
}
rows = self.provinces.count;//根据plist文件中之数据返回rows
– (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component
__TVOS_PROHIBITED;//当用户单击选中该UIPickerView控件的指定列的指定列表项时将见面激发该措施
break;
六、UIPickerView的拓展
case 1:
实质上采用中UIPickerView经常与UITextField配合下，给大家提供一个生有利的封装类YLSOPickerView。
rows = self.cities.count;
调用方法
break;
1、导入#import “YLSOPickerView.h”
default:
2、在- (BOOL)textFieldShouldBeginEditing:(UITextField
*)textField实现
break;
#pragma mark UITextFieldDelegate
}
– (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
return rows;
{
}
if (textField.tag==401) {
YLSOPickerView *picker = [[YLSOPickerView alloc]init];
//每行的题
picker.array =
@[@”中信银行”,@”中国银行”,@”中国邮政储蓄银行”,@”上海浦东发展银行”,@”广发银行股份有限公司”,@”华夏银行”,@”中国农业银行”,@”中国工商银行”,@”中国建设银行”,@”招商银行”,@”中国民生银行”,@”兴业银行”,@”中国光大银行”,@”交通银行”];
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component
picker.title = bank;
{
[picker show];
NSString * title = nil;
UITapGestureRecognizer *tapGestureRecognizer =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(keyboardHide:)];
switch (component) {
//设置成NO表示手上控件响应后会见传播到其他控件上，默认为YES。
case 0:
tapGestureRecognizer.cancelsTouchesInView = YES;
title = self.provinces[row][@”State”];
//将触摸事件添加至当下view
break;
[picker addGestureRecognizer:tapGestureRecognizer];
case 1:
return NO;
title = self.cities[row][@”city”];
}
break;
return YES;
default:
}
break;
3、实现声明手势注销方法
}
– (void)keyboardHide:(UITapGestureRecognizer *)tap
return title;
{
}
YLSOPickerView *pickView=(YLSOPickerView *)tap.view;//最好用单例
[pickView quit];
//选中时回调的托方，在这个措施被贯彻省与市之中的联动
}
-(void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component
4、-viewDidload里面声明通知
{
– (void)viewDidLoad
switch (component) {
{
case
0://选中省份表盘时，根据row的价改变都会往往组，刷新都屡屡组，实现联动
[super viewDidLoad];
self.cities = self.provinces[row][@”Cities”];
//接受通知
[self.pickerView reloadComponent:1];
[[NSNotificationCenter defaultCenter]addObserver:self
selector:@selector(getValue:) name:@”value” object:nil];
break;
}
case 1:
5、实现通方法
self.label.text = [NSString
stringWithFormat:@”%@%@”,self.provinces[[self.pickerView
selectedRowInComponent:0]][@”State”],self.cities[[self.pickerView
selectedRowInComponent:1]][@”city”]];//如果当选第二单
-(void)getValue:(NSNotification *)notification//点击完成出口选中的text
break;
{
self.textFeild.text = notification.object;
default:
DLog(@”%@”, self.textFeild.text);
break;
}
}
参考：
}
iOS系统UIPickerView的概括用以及方式属性介绍
UIPickerView
//修改pickerview的title样式
iOS学习 – UIPickerView
//#pragma mark pickerView Method
iOS选择器视图控件(UIPickerView)使用办法总结
//- (NSInteger)numberOfComponentsInPickerView:(UIPickerView
*)pickerView
YLSPicker
//{
// return 1;//表盘数量
//}
//
////判断是孰pickerview，返回相应的rows
//- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
//{
// NSInteger rows = 0;
//
// if (pickerView == self.pickerView)
// {
// rows = self.pickerViewArr.count;
// }
// else
// {
// rows = self.pickerViewArr2.count;
// }
//
// return rows;
//}
//
////判断是哪个pickerview，返回相应的title
//- (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component
//{
// NSString *str = nil;
//
// if (pickerView == self.pickerView)
// {
// str = self.pickerViewArr[row];
// }
// else
// {
// str = self.pickerViewArr2[row];
// }
// return str;
//}
//
//#pragma mark 给pickerview设置字体大小和颜色相当
//- (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row forComponent:(NSInteger)component
reusingView:(UIView *)view
//{
// //可以经从定义label达到从定义pickerview展示数据的道
// UILabel* pickerLabel = (UILabel*)view;
//
// if (!pickerLabel)
// {
// pickerLabel = [[UILabel alloc] init];
// pickerLabel.adjustsFontSizeToFitWidth = YES;
// pickerLabel.textAlignment = NSTextAlignmentCenter;
// [pickerLabel setBackgroundColor:[UIColor lightGrayColor]];
// [pickerLabel setFont:[UIFont boldSystemFontOfSize:15]];
// }
//
// pickerLabel.text=[self pickerView:pickerView titleForRow:row
forComponent:component];//调用上一个信托方，获得要显示的title
// return pickerLabel;
//}
////选中某行后回调的方式，获得选中结果
//- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component
//{
// if (pickerView == self.pickerView)
// {
// self.pickerViewSelect = self.pickerViewArr[row];
// NSLog(@”selected == %@”,self.pickerViewSelect);
// }
// else
// {
// self.pickerViewSelect2 = self.pickerViewArr2[row];
// }
//}
//转自链接：http://www.jianshu.com/p/811882ba8d78
– (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end