iOS软件开发 如何做一个选择器

由于苹果没有提供创建选择器的类，所以自己做了一个选择器，主要是通过UIButton来实现，希望可以帮助大家，如果有不好的地方希望能给我提出来。下面是我选择器实现的方法

<span style="font-size:14px;">#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

//设置背景图
UIImage *backgroundImage = [UIImage imageNamed: [[NSBundle mainBundle] pathForResource:@"Login_Background_Image" ofType:@"jpg"]];

UIImageView *backgroundImageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];

backgroundImageView.image = backgroundImage;

[self.view addSubview:backgroundImageView];
//初始化UITextField
NSArray *placeholderArray = @[@"请输入账号", @"请输入密码"];

CGFloat textFieldX = 10;
CGFloat textFieldY = 100;
CGFloat textFieldW = CGRectGetWidth([UIScreen mainScreen].bounds) - textFieldX * 2;
CGFloat textFieldH = 44;

for (int i = 0; i < placeholderArray.count; i ++) {

UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(textFieldX, textFieldY + (textFieldH + 10) * i, textFieldW, textFieldH)];

textField.placeholder = placeholderArray[i];

textField.borderStyle = UITextBorderStyleRoundedRect;

textField.tag = 10 + i;

[self.view addSubview:textField];
}

//初始化选择器按钮
UIButton *checkbox=[[UIButton alloc]initWithFrame:CGRectZero];

[self.view addSubview:checkbox];

UITextField *textField = (UITextField *)[self.view viewWithTag:11];

checkbox.frame = CGRectMake(30, CGRectGetMaxY(textField.frame) + 20, 20, 20);

[checkbox setImage:[UIImage imageNamed:@"userChoose.png"]forState:UIControlStateNormal];

[checkbox setImage:[UIImage imageNamed:@"success.png"]forState:UIControlStateSelected];

[checkbox addTarget:self action:@selector(checkboxClick:)forControlEvents:UIControlEventTouchUpInside];

[checkbox setSelected:NO];//设置按钮得状态是否为选中（可在此根据具体情况来设置按钮得初始状态）

CGFloat labelX = CGRectGetMaxX(checkbox.frame) + 5;
CGFloat labelY = CGRectGetMaxY(textField.frame) + 20;
CGFloat labelW = 100;
CGFloat labelH = 20;

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(labelX, labelY, labelW, labelH)];

label.text = @"记住密码";

label.textColor = [UIColor whiteColor]
;

label.font = [UIFont boldSystemFontOfSize:15];

[self.view addSubview:label];

}</span>

实现checkbox方法

//实现checkboxClick方法

-(void)checkboxClick:(UIButton *)sender{

sender.selected = !sender.selected;//每次点击都改变按钮的状态

if (sender.selected){

}else{

//在此实现打勾时的方法

}

//在此实现不打勾时的方法

}

没有选择记住密码之前的效果



选择记住密码之后