霓虹灯动态效果,限定文本框的输如长度

//
//  CCLAppDelegate.m
//  TestNeonLamp
//
//  Created by lanouhn on 14-8-19.
//  Copyright (c) 2014年 vaercly@163.com 陈聪雷. All rights reserved.
//

#import "CCLAppDelegate.h"

@interface CCLAppDelegate ()
{
    UIView *_backgroundView;
    NSArray *_array;
}
@end

@implementation CCLAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    
    self.window.backgroundColor = [UIColor whiteColor];
    //背景视图
    [self creatBGView];
    //霓虹灯视图
    [self creatNeonLamp];
    //定时器
    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(change) userInfo:nil repeats:YES];
    //限制输入框的文本长度
//    [self creatTextField];
    
    [self.window makeKeyAndVisible];
    return YES;
}

//背景视图
- (void)creatBGView
{
    _backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
    _backgroundView.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:_backgroundView];
    [_backgroundView release];
}

//霓虹灯视图
- (void)creatNeonLamp
{
    //指定颜色
    _array = [NSArray arrayWithObjects:[UIColor redColor], [UIColor orangeColor], [UIColor yellowColor], [UIColor greenColor], [UIColor blueColor], [UIColor cyanColor], [UIColor purpleColor], nil];
    for (int i = 0; i < 7; i++) {
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0 + 24 * i, 0 + 24 * i, 320 - 48 * i, 568 - 48 * i)];
        //色相, 饱和度, 亮度
        /*
         CGFloat color = (arc4random() % 256 / 255.0 );
         CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;
         CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;
         view.backgroundColor = [UIColor colorWithHue:color saturation:saturation brightness:brightness alpha:1];
         */
        //RGB
        /*
        CGFloat red = arc4random() % 256 /255.0;
        CGFloat green = arc4random() % 256 /255.0;
        CGFloat blue = arc4random() % 256 /255.0;
        view.backgroundColor = [UIColor colorWithRed:red green:green blue:blue alpha:1];
         */
        view.backgroundColor = _array[i];
        view.tag = 100 + i;
        [_backgroundView addSubview:view];
        [view release];
    }
    
}

- (void)change
{

    NSArray *arr = [NSArray arrayWithObjects:[UIColor redColor], [UIColor orangeColor], [UIColor yellowColor], [UIColor greenColor], [UIColor blueColor], [UIColor cyanColor], [UIColor purpleColor], nil];
    
    static int i = 0;
    
    for (int j = 0; j < 7 - i; j++) {
        UIView *view = (UIView *)[_backgroundView viewWithTag:100 + j];
        view.backgroundColor = arr[j + i];
    }
    
    for (int j = 6 - i, k = 0; j < 7; j++, k++) {
        UIView *view = (UIView *)[_backgroundView viewWithTag:100 + j];
        view.backgroundColor = arr[k];
    }
    
    i++;
    if (i > 6) {
        i = 0;
    }
}

- (void)creatTextField
{
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(80, 50, 160, 40)];
    textField.placeholder = @"限定5个字符";
    textField.clearButtonMode = UITextFieldViewModeWhileEditing; //编辑时会出现个修改X
    textField.layer.cornerRadius = 5;
    textField.borderStyle = UITextBorderStyleLine | UITextBorderStyleRoundedRect;
    textField.delegate = self;
    NSLog(@"%@", textField.text);
    [_backgroundView addSubview:textField];
    [textField release];
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    NSLog(@"textFieldShouldBeginEditing");
    textField.clearsOnBeginEditing = YES;
    textField.layer.borderColor = [UIColor orangeColor].CGColor;
    textField.layer.borderWidth = 1;
    return YES;
}// return NO to disallow editing.
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    
}// became first responder
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    NSLog(@"textFieldShouldEndEditing");
    textField.layer.borderColor = [UIColor greenColor].CGColor;
    textField.layer.borderWidth = 1;
    return YES;
}// return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
- (void)textFieldDidEndEditing:(UITextField *)textField
{
    
}// may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSLog(@"%@", NSStringFromRange(range));
    NSLog(@"%@", string);
    NSString * aString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if (aString.length > 5) {
        textField.text = [aString substringToIndex:5];
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle:nil
                              message:@"超过最大字数不能输入了"
                              delegate:nil
                              cancelButtonTitle:@"Ok"
                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
        return NO;
    }
    
    return YES;

}// return NO to not change text

- (BOOL)textFieldShouldClear:(UITextField *)textField
{
    textField.text = @"";
    return YES;
}// called when clear button pressed. return NO to ignore (no notifications)

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application
{
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

- (void)dealloc
{
    [_window release];
    [super dealloc];
}

@end