给UIAlertView添加UITextField模拟登录框

首先要自定义一个UIAlertView扩展类，如MAlertView：

.h文件

#import<Foundation/Foundation.h>

@interface MAlertView :UIAlertView {

    UITextField *passwdField;

    NSInteger textFieldCount;

}

- (void)addTextField:(UITextField *)aTextField placeHolder:(NSString *)placeHolder;

@end

.m文件

#import"MAlertView.h"

#define kMAlertViewTextFieldHeight30.0

#define kMAlertViewMargin10.0

@implementation MAlertView

- (void)initialize{

}

//2 buttons supported at most

- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ...{

    if ((self = [superinitWithTitle:title message:message delegate:delegate cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitles,nil])) {

    }

   return self;

}

- (void)layoutSubviews{

    CGRect rect = self.bounds;

    rect.size.height += textFieldCount*(kMAlertViewTextFieldHeight +kMAlertViewMargin);

    self.bounds = rect;

    float maxLabelY = 0.f;

    int textFieldIndex = 0;

    for (UIView *view in self.subviews) {

       if ([view isKindOfClass:[UIImageViewclass]]) {

            

        }

      else if ([view isKindOfClass:[UILabelclass]]) {

           

            rect = view.frame;

            maxLabelY = rect.origin.y + rect.size.height;

        }

       else if ([view isKindOfClass:[UITextFieldclass]]) {

            

            rect = view.frame;

            rect.size.width =self.bounds.size.width - 2*kMAlertViewMargin;

            rect.size.height = kMAlertViewTextFieldHeight;

            rect.origin.x =kMAlertViewMargin;

            rect.origin.y = maxLabelY +kMAlertViewMargin*(textFieldIndex+1) + kMAlertViewTextFieldHeight*textFieldIndex;

            view.frame = rect;

            textFieldIndex++;

        }

       else {  //UIThreePartButton

            

            rect = view.frame;

            rect.origin.y =self.bounds.size.height - 65.0;

            view.frame = rect;

        }

    }

}

- (void)addTextField:(UITextField *)aTextField placeHolder:(NSString *)placeHolder{

    if (aTextField != nil) {

       textFieldCount++;

        aTextField.frame =CGRectZero;

        aTextField.borderStyle =UITextBorderStyleRoundedRect;

        aTextField.placeholder = placeHolder;

        [selfaddSubview:aTextField];

//        [self setNeedsLayout];

    }

}

@end

如何使用此扩展类：

- (void)viewDidLoad

{

    [superviewDidLoad];

    MAlertView *alert = [[MAlertViewalloc]initWithTitle:@"Title"message:nildelegate:selfcancelButtonTitle:@"Cancel"otherButtonTitles:@"OK",nil];

    UITextField* accountField=[[UITextFieldalloc]init];

    UITextField* passwdField=[[UITextFieldalloc]init];

    [alert addTextField:accountField placeHolder:@"Account"];

    [alert addTextField:passwdField placeHolder:@"Password"];

    [alert show];

    [alert release];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex//按键响应函数

{

    NSString* msg = [[NSStringalloc]initWithFormat:@"您按下的第%d个按钮！",buttonIndex];

    UIAlertView* alert = [[UIAlertViewalloc]initWithTitle:@"提示"

                                                   message:msg

                                                  delegate:nil

                                         cancelButtonTitle:@"确定"

                                         otherButtonTitles:nil];

    [alert show];

    [alert release];

    [msg release];

    

}

效果如图。

进行了简单的封装，只需要用addTextField:placeHolder:方法将textField加进去就好了，其他使用方法和UIAlertView完全一样。
再作些补充说明：因为UIAlertView只有在点击了按钮才能进行交互，所有的text值都是在点击之后获取对应的textField的值。
有些朋友说空值的情况，这个可以在点击之后判断如果是空值就再次弹出alertView就可以了

参考：http://www.cocoachina.com/bbs/read.php?tid=86733

下载源代码：http://download.csdn.net/detail/x1135768777/4214283