UIPickerview

#import"ViewController.h"

@interfaceViewController()

@property(nonatomic,strong)UIPickerView*pickerView;

@property(nonatomic,strong)NSArray*pickerViewData;//注意加上这句

@property(nonatomic,strong)NSArray*pickerViewData1;//注意加上这句

@property(nonatomic,strong)NSArray*pickerViewData2;//注意加上这句

@property(nonatomic,strong)UILabel* mylabel;

@end

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

self.mylabel=[[UILabelalloc]initWithFrame:CGRectMake(0,100,self.view.frame.size.width,40)];

[self.viewaddSubview:self.mylabel];

self.pickerView=[[UIPickerViewalloc]initWithFrame:CGRectMake(0,200,self.view.frame.size.width,300)];

self.pickerView.delegate=self;

self.pickerView.dataSource=self;

self.pickerView.showsSelectionIndicator=YES;

[self.viewaddSubview:self.pickerView];

NSArray*array=[[NSArrayalloc]initWithObjects:@"one",

@"two",

@"three",

@"four",

@"five",

nil];

self.pickerViewData= array;//注意一定要写self，否则不对

self.pickerViewData1=@[@"每天",@"爱你",@"多",@"一",@"点"];

self.pickerViewData2=@[@"1",@"2",@"3",@"3",@"4"];

}

//组数

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView

{

return3;

}

//每组元素个数

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

{

if(component==0) {

return[_pickerViewDatacount];

}elseif(component==1){

return[_pickerViewData1count];

}

else{

return[_pickerViewData2count];

}

}

//每个元素的内容

-(UIView*)pickerView:(UIPickerView*)pickerView

titleForRow:(NSInteger)row

forComponent:(NSInteger)component

{

if(component==0) {

return[_pickerViewDataobjectAtIndex:row];

}elseif(component==1){

return[_pickerViewData1objectAtIndex:row];

}

else{

return[_pickerViewData2objectAtIndex:row];

}

}

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

if(component==0) {

self.mylabel.text=[self.pickerViewDataobjectAtIndex:row];

NSLog(@"%@",self.mylabel.text);

}

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end