【读书笔记】UIWindow-密码框

#import <UIKit/UIKit.h>

@interface PasswordInputWindow : UIWindow

+(PasswordInputWindow *)shareInstance;
-(void)show;

@end

#import "PasswordInputWindow.h"

@implementation PasswordInputWindow
{
UITextField *_textField;
}

+(PasswordInputWindow *)shareInstance
{
static id shareInstance=nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken,^{

shareInstance=[[self alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
});
return shareInstance;
}
-(id)initWithFrame:(CGRect)frame
{
self=[super initWithFrame:frame];
if (self) {

UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(10, 50, 200, 20)];
label.text=@"请输入密码";
[self addSubview:label];

UITextField *textField=[[UITextField alloc]initWithFrame:CGRectMake(10, 80, 200, 20)];
textField.backgroundColor=[UIColor whiteColor];
textField.secureTextEntry=YES;
[self addSubview:textField];

UIButton *button=[[UIButton alloc] initWithFrame:CGRectMake(10, 110, 200, 44)];
[button setBackgroundColor:[UIColor blueColor]];
button.titleLabel.textColor=[UIColor blackColor];
[button setTitle:@"确定" forState:UIControlStateNormal];
[button addTarget:self action:@selector(completeButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:button];

self.backgroundColor=[UIColor yellowColor];
_textField=textField;
}
return self;
}
-(void)show
{
[self makeKeyAndVisible];
self.hidden=NO;
}
-(void)completeButtonPressed:(id)sender{
if ([_textField.text isEqualToString:@"abcd"]) {
[_textField resignFirstResponder];
[self resignFirstResponder];
self.hidden=YES;
}else{
[self showErrorAlertView];
}
}
-(void)showErrorAlertView
{
UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:nil message:@"密码错误，正确密码是abcd" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alertView show];
}
@end