IOS中文本框输入自动隐藏和自动显示

uilabe和UIText扩展方法

+(UILabel*)LabWithFrame:(CGRect)_rect
                   text:(NSString*)aText
              textColor:(UIColor*)aColor
              textAlign:(NSTextAlignment)aAlign
                   font:(UIFont*)aFont{
    UILabel *lab = [[[UILabel alloc] initWithFrame:_rect] autorelease];
    lab.backgroundColor = [UIColor clearColor];
    if ([aText length] > )
        lab.text = aText;
    if (aColor)
        lab.textColor = aColor;
    if(aAlign)
        lab.textAlignment = aAlign;
    if (aFont)
        lab.font = aFont;
    return lab;
}
@end
@implementation UITextField (my)
+(UITextField*)TextFieldWithFrame:(CGRect)_rect
                           target:(id)target
                             text:(NSString*)aText
                        textColor:(UIColor*)aTextColor
                        textAlign:(NSTextAlignment)aAlign
                      placeHolder:(NSString*)holder
                        clearMode:(UITextFieldViewMode)aViewMode
{
    UITextField *textField = [[[UITextField alloc] initWithFrame:_rect] autorelease];
    textField.backgroundColor = [UIColor clearColor];
    textField.delegate = target;

    if (aAlign)
        textField.textAlignment = aAlign;
    if ([aText length] > )
        textField.text = aText;
    if (aTextColor)
        textField.textColor = aTextColor;
    if (aViewMode)
        textField.clearButtonMode = aViewMode;
    if ([holder length] > )
        textField.placeholder = holder;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    return textField;
}

在viewdidLoad中初始化控件，并且把label放入到集合中

#import "UILabel+my.h"
#import "UITextField+my.h"

#define KPadding 10
#define KLbWidth 100
#define KlbHeight 50
#define KFont 12
#define kTextHeight 30
@interface ViewController ()
{
    UITextField *UserNameField;
    UITextField *PassWordField;
    UITextField *yzmField;
    UILabel *lb;
}
//存放文本框的集合
@property(nonatomic,retain)NSMutableArray *UIElementLabArray;
//存放文本的标题
@property(nonatomic,retain)NSMutableArray *UIELementLabTitleArray;
//初始化存放所有uilabe的集合。
@property(nonatomic,retain)NSMutableArray *UIElementArray;

@end

-(void)InitController{
    UserNameField=[UITextField TextFieldWithFrame:CGRectMake(, , , ) target:nil text:@"" textColor:[UIColor blackColor] textAlign:NSTextAlignmentLeft placeHolder:@"" clearMode:UITextFieldViewModeWhileEditing];
    UserNameField.borderStyle=UITextBorderStyleRoundedRect;
    UserNameField.keyboardType=UIKeyboardTypeNumberPad;
    [self.view addSubview:UserNameField];
    PassWordField=[UITextField TextFieldWithFrame:CGRectMake(, , , ) target:nil text:@"" textColor:[UIColor blackColor] textAlign:NSTextAlignmentLeft placeHolder:@"" clearMode:UITextFieldViewModeWhileEditing];
    PassWordField.borderStyle=UITextBorderStyleRoundedRect;
    [self.view addSubview:PassWordField];
    yzmField=[UITextField TextFieldWithFrame:CGRectMake(, , , ) target:nil text:@"" textColor:[UIColor blackColor] textAlign:NSTextAlignmentLeft placeHolder:@"" clearMode:UITextFieldViewModeWhileEditing];
    yzmField.borderStyle=UITextBorderStyleRoundedRect;
    [self.view addSubview:yzmField];

    for (int i=; i<; i++) {
        UILabel *lb1=[UILabel LabWithFrame:CGRectZero text:@"" textColor:[UIColor blackColor] textAlign:NSTextAlignmentRight font:[UIFont systemFontOfSize:KFont]];
        [self.view addSubview:lb1];
        [self.UIElementLabArray addObject:lb1];
    }

}

- (UIImage *) ImageWithColor: (UIColor *) color frame:(CGRect)aFrame
{
    UIGraphicsBeginImageContext(aFrame.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, aFrame);

    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIImage *image=[self ImageWithColor:[UIColor colorWithRed:/255.0f green:/255.0f blue:/255.0f alpha:] frame:self.view.bounds];

    image= [image stretchableImageWithLeftCapWidth:image.size.width*0.5f topCapHeight:image.size.height*0.5f];
    UIImageView *imageview=[[UIImageView alloc] initWithImage:image];
    [self.view addSubview:imageview];

    self.UIElementLabArray=[NSMutableArray array];

    CGRect bRect=UIEdgeInsetsInsetRect(self.view.bounds, UIEdgeInsetsMake(KPadding, , KPadding, ));

    //每一行
    CGRect rowRect;
    //开始分割每一行
    CGRectDivide(bRect, &rowRect, &bRect, KlbHeight, CGRectMinYEdge);
    CGRect leftRect,rightRect;

    //开始分割每一列
    CGRectDivide(rowRect, &leftRect, &rightRect, KLbWidth, CGRectMinXEdge);

    lb=[UILabel LabWithFrame:leftRect text:@"username" textColor:[UIColor blackColor] textAlign:NSTextAlignmentRight font:[UIFont systemFontOfSize:KFont]];
    [self.view addSubview:lb];

    CGRect txtdiv=UIEdgeInsetsInsetRect(rightRect, UIEdgeInsetsMake(, KPadding, KPadding, ));
   UITextField * text=[UITextField TextFieldWithFrame:txtdiv target:self text:@"" textColor:[UIColor blackColor] textAlign:NSTextAlignmentLeft placeHolder:@"input" clearMode:UITextFieldViewModeWhileEditing];
    text.borderStyle=UITextBorderStyleRoundedRect;
    [self.view addSubview:text];

    [self InitController];

}

#pragma mark-UITextField delegate

-(void)textFieldDidEndEditing:(UITextField *)textField{

    //初始化数组
    self.UIElementArray=[NSMutableArray array];
    self.UIELementLabTitleArray=[NSMutableArray array];
    //得到数据
    NSArray *data=@[@"UN",@"PD",@"yzm"];
    for (int i=;i<data.count;i++) {
        NSString *str=data[i];
        if([str rangeOfString:@"UN"].location!=NSNotFound){
            [self.UIElementArray addObject:UserNameField];//添加文本框的控件
            [self.UIELementLabTitleArray addObject:data[i]];//添加对应(lable)的title
        }
        else if([str rangeOfString:@"PD"].location!=NSNotFound){
            [self.UIElementArray addObject:PassWordField];//添加文本框的控件
            [self.UIELementLabTitleArray addObject:data[i]];
        }
        else if([str rangeOfString:@"yzm"].location!=NSNotFound){
            [self.UIElementArray addObject:yzmField];//添加文本框的控件
            [self.UIELementLabTitleArray addObject:data[i]];
        }
    }
    CGFloat top=lb.bounds.origin.y+lb.bounds.size.height;
    CGFloat left=lb.bounds.origin.x;
    CGRect rect=UIEdgeInsetsInsetRect(self.view.bounds, UIEdgeInsetsMake(top, left, , ));//开始规划显示控件的Rect
    CGRect rowRect;

   [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3];
    for (int i=; i<self.UIElementArray.count; i++) {

        //开始分割每一行，brect每一行的高度
        CGRectDivide(rect, &rowRect, &rect,KlbHeight, CGRectMinYEdge);

        CGRect leftRect,rightRect;//leftRect代表label的rect,right代表textField的rect
        //开始分割行中列
        CGRectDivide(rowRect, &leftRect, &rightRect, KLbWidth, CGRectMinXEdge);
        UILabel *lbt=self.UIElementLabArray[i];
        lbt.text=self.UIELementLabTitleArray[i];
        lbt.frame=leftRect;

        //设置每一行的高度
        CGRect txtRect=UIEdgeInsetsInsetRect(rightRect, UIEdgeInsetsMake(, KPadding, , KPadding));
        UITextField *txt=self.UIElementArray[i];
        txt.frame=txtRect;

    }
    [UIView commitAnimations];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:];

    [UIView commitAnimations];
}

-(BOOL)textFieldShouldClear:(UITextField *)textField{
    [UIView animateWithDuration:0.3 animations:^{
        for(UILabel *label in self.UIElementLabArray){
            label.frame=CGRectZero;
        }
        for (UITextField *txt in self.UIElementArray) {
            txt.frame=CGRectMake(, , ,);
        }
    }];

    return YES;
}