UIActionSheet類系iOS開發中實現警告框的重要的類，而在好多應用中，都對它進行了擴充套件，今天介紹一下自定義風格的UIActionSheet

一、自定義CustomActionSheet類

  CustomActionSheet類繼承UIActionSheet，具體的實現如下所示：

  1）CustomActionSheet.h標頭檔案

#import <Foundation/Foundation.h>

@interface CustomActionSheet : UIActionSheet {
UIToolbar* toolBar;
UIView* view;
}
@property(nonatomic,retain)UIView* view;
@property(nonatomic,retain)UIToolbar* toolBar;

/*因為是通過給ActionSheet 加 Button來改變ActionSheet, 所以大小要與actionsheet的button數有關
 *height = 84, 134, 184, 234, 284, 334, 384, 434, 484
 *如果要用self.view = anotherview.  那麼another的大小也必須與view的大小一樣
 */
-(id)initWithHeight:(float)height WithSheetTitle:(NSString*)title;
@end
   
   2）CustomActionSheet.m實現檔案
#import "CustomActionSheet.h"

@implementation CustomActionSheet
@synthesize view;
@synthesize toolBar;
-(id)initWithHeight:(float)height WithSheetTitle:(NSString*)title
{
self = [super init];
    if (self) 
{
int theight = height - 40;
int btnnum = theight/50;
for(int i=0; i<btnnum; i++)
{
[self addButtonWithTitle:@" "];
}
toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
toolBar.barStyle = UIBarStyleBlackOpaque;
UIBarButtonItem *titleButton = [[UIBarButtonItem alloc] initWithTitle:title 
                                                                        style:UIBarButtonItemStylePlain 
                                                                       target:nil 
                                                                       action:nil];
        
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                                                                        style:UIBarButtonItemStyleDone 
                                                                       target:self
                                                                       action:@selector(done)];
        
UIBarButtonItem *leftButton  = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" 
                                                                        style:UIBarButtonItemStyleBordered 
                                                                       target:self 
                                                                       action:@selector(docancel)];
        
UIBarButtonItem *fixedButton  = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
                                                                                      target:nil 
                                                                                      action:nil];
        
NSArray *array = [[NSArray alloc] initWithObjects:leftButton,fixedButton,titleButton,fixedButton,rightButton,nil];
[toolBar setItems: array];
[titleButton release];
[leftButton  release];
[rightButton release];
[fixedButton release];
[array       release];
[self addSubview:toolBar];
view = [[UIView alloc] initWithFrame:CGRectMake(0, 44, 320, height-44)];
view.backgroundColor = [UIColor groupTableViewBackgroundColor];
[self addSubview:view];
    }
    return self;
}
-(void)done
{
[self dismissWithClickedButtonIndex:0 animated:YES];
}
-(void)docancel
{
[self dismissWithClickedButtonIndex:0 animated:YES];
}
-(void)dealloc
{
[view release];
[super dealloc];
}
@end
 

#import "TestActionSheetViewController.h"
#import "CustomActionSheet.h"
@implementation TestActionSheetViewController

-(IBAction)btndown
{
CustomActionSheet* sheet = [[CustomActionSheet alloc] initWithHeight:284.0f 
                                                          WithSheetTitle:@"自定義ActionSheet"];
UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(0,50, 320, 50)];
label.text = @"這裡是要自定義放的控制";
label.backgroundColor = [UIColor clearColor];
label.textAlignment = UITextAlignmentCenter;
[sheet.view addSubview:label];
[sheet showInView:self.view];
[sheet release];
}
@end
 

    這裡的UILabel是作一個示例，在這個位置你可以換成你自己的內容即可；

三、效果圖