[iPhone中级] IOS中实现自定义UICombox

我们在做IOS开发的时候，有时候会限制于系统自带的一些控件，而无法做到更好的用户体验，今天我们就来介绍一下我们自己做的UICombox控件，先来看一下图：

这是我们自定义的控件，实现了点击输入框，弹出数据拾取器的效果

首先我们先来整理一下思路，UICombox看上去像UITextField吧，只是旁边多了一个小图片，那我们就可以通过继承UITextField来实现，并重新整理UITextField的框架。

接下来就是下面的数据拾取器了，看到半遮照的效果，我们应该能想到是UIActionSheet吧，只不过我们把Action中的按钮换成了我们自定义的效果，好了，思路整理得差不多，我们就来编码了

[java]
#import <Foundation/Foundation.h>

@inte易做图ce UICombox: UITextField<UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource> {
@private
UIActionSheet *action;
UIPickerView *picker;
}

@property(nonatomic, copy) NSArray *items;
- (void)initComponents;

@end

#import <Foundation/Foundation.h>

@inte易做图ce UICombox: UITextField<UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource> {
@private
UIActionSheet *action;
UIPickerView *picker;
}

@property(nonatomic, copy) NSArray *items;
- (void)initComponents;

@end这里我说一下，首先我们的UICombox继承了UITextField，接着需要实现UIPickerView的一些方法才能产生我们需要的效果。items是由我们前部传过来UICombx中需要显示的值。还定义了一个初始化组件的方法。

[java]
-(void) didMoveToWindow {
 UIWindow* appWindow = [self window];
 if (appWindow != nil) {
 [self initComponents];
 }
}

-(void) didMoveToWindow {
UIWindow* appWindow = [self window];
if (appWindow != nil) {
        [self initComponents];
    }
}初如化组件，程序启动的时候就进行初始化

[java] view plaincopyprint?- (void)initComponents{
 if(action != nil) return;
 //Create UIDatePicker with UIToolbar.
 action = [[UIActionSheet alloc] initWithTitle:@""
 delegate:nil
 cancelButtonTitle:nil
 destructiveButtonTitle:nil
 otherButtonTitles:nil];
 //创建PickView
 picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)];
 picker.showsSelectionIndicator = YES;
 picker.delegate = self;
 picker.dataSource = self;

 //顶部工具条
 UIToolbar *datePickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
 datePickerToolbar.barStyle = UIBarStyleBlackOpaque;
 [datePickerToolbar sizeToFit];

 //定义两个按钮
 NSMutableArray *barItems = [[NSMutableArray alloc] init];
 UIBarButtonItem *btnFlexibleSpace = [[UIBarButtonItem alloc]
 initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
 target:self action:nil];
 [barItems addObject:btnFlexibleSpace];
 [btnFlexibleSpace release];

 UIBarButtonItem *btnCancel = [[UIBarButtonItem alloc]
 initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
 target:self
 action:@selector(doCancelClick:)];
 [barItems addObject:btnCancel];
 [btnCancel release];

 UIBarButtonItem *btnDone = [[UIBarButtonItem alloc]
 initWithBarButtonSystemItem:UIBarButtonSystemItemDone
 target:self
 action:@selector(doDoneClick:)];

 [barItems addObject:btnDone];
 [btnDone release];
 [datePickerToolbar setItems:barItems animated:YES];
 [barItems release];

 [action addSubview: datePickerToolbar];
 [action addSubview: picker];

 [datePickerToolbar release];

}

- (void)initComponents{ 补充：移动开发 , IOS ,