【代码笔记】单项选择框

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

//方便跳转到相应的页面
@property (nonatomic , retain) NSString* type;

@end

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController
{
    int butTag;
}
@synthesize type;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title=@"选择框";
    
    self.view.backgroundColor=[UIColor orangeColor];
    
    NSArray *array=[NSArray arrayWithObjects:@"学生",@"家长",@"老师", nil];
    for (int i = 0; i<3; i++) {
        
        //字后面的Label
        UILabel *lab=[[UILabel alloc]initWithFrame:CGRectMake(60+80*i, 100, 50, 15)];
        [lab setFont:[UIFont systemFontOfSize:15]];
        [lab setTextColor:[UIColor grayColor]];
        [lab setBackgroundColor:[UIColor clearColor]];
        [lab setText:[array objectAtIndex:i]];
        [self.view addSubview:lab];
        
        butTag=100 ;
        
        //能点击的小圆点按钮
        UIButton *but=[UIButton buttonWithType:UIButtonTypeCustom];
        [but setFrame:CGRectMake(40+80*i, 100, 15, 15)];
        [but setImage:[UIImage imageNamed:@"1"] forState:UIControlStateNormal];
        [but setImage:[UIImage imageNamed:@"2"] forState:UIControlStateSelected];
        [but addTarget:self action:@selector(choose:) forControlEvents:UIControlEventTouchUpInside];
        [but setTag:i+100];
        [self.view addSubview:but];
        
        if (butTag == i + 100) {
            [but setSelected:YES];
            [but setUserInteractionEnabled:NO];
        }
    }

}

//选择角色
- (void)choose:(UIButton *)sender{
    
    UIButton *button = (UIButton *)[self.view viewWithTag:butTag];
    [button setSelected:NO];
    [button setUserInteractionEnabled:YES];
    
    [sender setUserInteractionEnabled:NO];
    [sender setSelected:YES];
    
    int intvalue = (int)sender.tag -100;
    NSString *typeStr=[NSString stringWithFormat:@"%i",intvalue];
    self.type = typeStr;
    NSLog(@"self.type = %@",self.type);

    butTag = (int)sender.tag;
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

2015-10-13 13:59:33.313 选择框[7842:203451] self.type = 1
2015-10-13 13:59:33.921 选择框[7842:203451] self.type = 2
2015-10-13 13:59:34.569 选择框[7842:203451] self.type = 1
2015-10-13 13:59:35.345 选择框[7842:203451] self.type = 0
2015-10-13 13:59:36.897 选择框[7842:203451] self.type = 1