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一：模態視圖
UIActionSheet、UIAlertView、GKPeerPickerController、UIAPopover、GKPanel等都是ios系統自帶
的模態視圖。
模態視圖的一個重要的特性就是在顯示模態視圖的時候可以阻斷其他視圖的事件響應。
該特性在有些時候對我們是非常有用的。
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那么任何自己實現一個模態視圖呢?
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一種方式就是自己實現一個UIViewController,然后作為一個modalViewController視圖顯示。這種方式固然可以
，但是需要的工作量可就不少了，例如顯示動畫，動態布局等等。
這里我要說的另一種方法，就是實現這些系統模態視圖的子視圖，對系統視圖進行定制，以滿足我們自己的需求。可以完美的使用系統模態
視圖已經提供的動畫、自動布局等等行為。
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二：系統模態視圖的顯示方式
系統模態視圖的顯示和上面提到到的自定義模態視圖的顯示方式有很大的差別。
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UIActionSheet、UIAlertView、GKPeerPickerController、UIAPopover、GKPanel 都是UIView的子類，
如果直接在讀取視圖之上顯示這些UIActionSheet等等的視圖，是無法阻斷事件的。因此系統自帶的這些模態
視圖先被添加到一個UIWindow的視圖，再把給window視圖作為application的keyWindow顯示。也就是在顯示
模態視圖的時候，application的多window的。
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三：移除系統模態
調用dismiss系列的方法移除模態視圖
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四：模態視圖的實現基礎
所有的模態視圖都基于UIViewControll提供的兩個方法：
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– presentModalViewController:animated:
– dismissModalViewControllerAnimated:
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UIActionSheet、UIAlertView的實現都是對這兩個方法的實現和在實現。
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五：向模態視圖添加其他UIView的方式：
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一：動態添加UIView
（1）：通過[UIApplication sharedApplication].keyWindow 取得當前的makeKeyAndVisible window，該window的
大小是這個屏幕的大小，和該window包含的 UIActionSheet等視圖不是一個級別。UIActionSheet 僅僅是該window的
一個子視圖而已。
[[UIApplication sharedApplication].keyWindow addSubview:self.progressHUD];
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（2）:根據讀取模態視圖的window屬性，取得當前的makeKeyAndVisible window
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? ? [self.actionSheet.window addSubview:self.progressHUD]
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注意：以上兩種方式一定要在模態視圖顯示出來之后再添加其他的UIview，否則添加的UIView可能無法顯示。
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二：靜態添加UIView
把需要添加的UIView視圖直接在模態視圖的drawRect方法中添加就可以了。這些在顯示模態視圖時候，添加的
UIView也會被顯示處理。
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UIActionSheet 視圖的自定義
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//
// UserDetailVoiceCustomActionSheet.h
// BaiHe
//
// Created by xu on 12-12-15.
// Copyright (c) 2012年 itotemstudio. All rights reserved.
//
#import <UIKit/UIKit.h>
@protocol BHCustomActionSheetDelegate <NSObject>
@optional
- (void)actionSheet:(UIActionSheet *)actionSheet clickedOtherButtonAtIndex:(NSInteger)buttonIndex;
- (void)actionSheetCancel:(UIActionSheet *)actionSheet;
- (void)actionSheetDestructive:(UIActionSheet *)actionSheet;
@end
@interface BHCustomActionSheet : UIActionSheet
{
UIButton *_destructiveButton;
id<BHCustomActionSheetDelegate> _customActionDelegate;
}
@property (nonatomic, retain) UIButton *destructiveButton;
@property (nonatomic, assign) id<BHCustomActionSheetDelegate> customActionDelegate;
@end
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//
// UserDetailVoiceCustomActionSheet.m
// BaiHe
//
// Created by xu on 12-12-15.
// Copyright (c) 2012年 itotemstudio. All rights reserved.
//
#import "BHCustomActionSheet.h"
#import "UIImageExt.h"
@interface BHCustomActionSheet ()
- (void)clickedOtherButton:(id)sender;
- (void)clickCanncelButton;
- (void)clickDestructiveButton;
@end
@implementation BHCustomActionSheet
@synthesize destructiveButton = _destructiveButton;
@synthesize customActionDelegate = _customActionDelegate;
- (void)dealloc
{
_customActionDelegate = nil;
RELEASE_SAFELY(_destructiveButton);
[super dealloc];
}
//去除背景色
- (void)drawRect:(CGRect)rect
{
UIImageView *bgView = [[[UIImageView alloc] initWithFrame:self.bounds] autorelease];
bgView.image = [[UIImage imageNamed:@"bg"] resizeUsingCapInsets:UIEdgeInsetsMake(180.f, 5.f, 4.f, 4.f)];
[self addSubview:bgView];
UILabel *titleLabel = nil;
NSMutableArray *buttons = [NSMutableArray arrayWithCapacity:10];
for (UIView *view in self.subviews) {
if ([view isKindOfClass:[UIControl class]]) {
[self bringSubviewToFront:view];
[buttons addObject:view];
[view removeFromSuperview];
}
if ([view isKindOfClass:[UILabel class]]) {
titleLabel = (UILabel *)view;
}
}
// if (titleLabel) {
CGRect hilghtBgImageFrame = CGRectMake(0.0f, 0.0f, CGRectGetWidth(rect), CGRectGetMaxY(titleLabel.frame) == 0.f?60.f:CGRectGetMaxY(titleLabel.frame) + 5.f);
UIImageView *hilghtBgImageView = [[[UIImageView alloc] initWithFrame:hilghtBgImageFrame] autorelease];
[self addSubview:hilghtBgImageView];
[self bringSubviewToFront:titleLabel];
hilghtBgImageView.image = [[UIImage imageNamed:@"bg-highlight"] resizeUsingCapInsets:UIEdgeInsetsMake(31.f, 5.f, 42.f, 4.f)];
// }
NSMutableIndexSet *delSet = [NSMutableIndexSet indexSet];
if (self.destructiveButtonIndex >= 0) {
NSString *destructiveButtonTitle = [self buttonTitleAtIndex:self.destructiveButtonIndex];
UIButton *customDestructiveBut = [UIButton buttonWithType:UIButtonTypeCustom];
self.destructiveButton = customDestructiveBut;
[customDestructiveBut setTitleColor:[UIColor whiteColor]
forState:UIControlStateNormal];
[customDestructiveBut setTitleShadowColor:[UIColor whiteColor]
forState:UIControlStateNormal];
customDestructiveBut.titleLabel.font = [UIFont boldSystemFontOfSize:18.f];
[customDestructiveBut setBackgroundImage:[[UIImage imageNamed:@"but_Destructive"] resizeUsingCapInsets:UIEdgeInsetsMake(15.f, 50., 20.f, 60.f)]
forState:UIControlStateNormal];
[customDestructiveBut addTarget:self
action:@selector(clickDestructiveButton)
forControlEvents:UIControlEventTouchUpInside];
customDestructiveBut.frame = ((UIControl *)[buttons objectAtIndex:self.destructiveButtonIndex]).frame;
[customDestructiveBut setTitle:destructiveButtonTitle forState:UIControlStateNormal];
[self addSubview:customDestructiveBut];
[delSet addIndex:self.destructiveButtonIndex];
}
if (self.cancelButtonIndex >= 0) {
NSString *cancelButtonTitle = [self buttonTitleAtIndex:self.cancelButtonIndex];
UIButton *customCancelBut = [UIButton buttonWithType:UIButtonTypeCustom];
[customCancelBut setTitleColor:[UIColor grayColor]
forState:UIControlStateNormal];
[customCancelBut setTitleShadowColor:[UIColor grayColor]
forState:UIControlStateNormal];
customCancelBut.titleLabel.font = [UIFont boldSystemFontOfSize:18.f];
[customCancelBut setBackgroundImage:[[UIImage imageNamed:@"but_Cancel"] resizeUsingCapInsets:UIEdgeInsetsMake(15.f, 50., 20.f, 60.f)]
forState:UIControlStateNormal];
[customCancelBut addTarget:self
action:@selector(clickCanncelButton)
forControlEvents:UIControlEventTouchUpInside];
customCancelBut.frame = ((UIControl *)[buttons objectAtIndex:self.cancelButtonIndex]).frame;
[customCancelBut setTitle:cancelButtonTitle forState:UIControlStateNormal];
[self addSubview:customCancelBut];
[delSet addIndex:self.cancelButtonIndex];
}
[buttons removeObjectsAtIndexes:delSet];
int index = 0;
for (UIControl *control in buttons) {
NSString *otherButtonTitle = [self buttonTitleAtIndex:index];
UIButton *customOtherBut = [UIButton buttonWithType:UIButtonTypeCustom];
[customOtherBut setTitleColor:[UIColor grayColor]
forState:UIControlStateNormal];
[customOtherBut setTitleShadowColor:[UIColor grayColor]
forState:UIControlStateNormal];
customOtherBut.titleLabel.font = [UIFont boldSystemFontOfSize:18.f];
[customOtherBut setBackgroundImage:[[UIImage imageNamed:@"but_Cancel"] resizeUsingCapInsets:UIEdgeInsetsMake(15.f, 50., 20.f, 60.f)]
forState:UIControlStateNormal];
customOtherBut.tag = index;
[customOtherBut addTarget:self
action:@selector(clickedOtherButton:)
forControlEvents:UIControlEventTouchUpInside];
customOtherBut.frame = ((UIControl *)[buttons objectAtIndex:index]).frame;
[customOtherBut setTitle:otherButtonTitle forState:UIControlStateNormal];
[self addSubview:customOtherBut];
index ++;
}
[buttons removeAllObjects];
}
#pragma mark - Private Method
- (void)clickedOtherButton:(id)sender
{
NSInteger index = ((UIControl *)sender).tag;
if (self.customActionDelegate
&& [self.customActionDelegate respondsToSelector:@selector(actionSheet:clickedButtonAtIndex:)]) {
[self.customActionDelegate actionSheet:self clickedOtherButtonAtIndex:index];
}
[self clickCanncelButton];
}
- (void)clickCanncelButton
{
if (self.customActionDelegate
&& [self.customActionDelegate respondsToSelector:@selector(actionSheetCancel:)]) {
[self.customActionDelegate actionSheetCancel:self];
}
[UIApplication sharedApplication].statusBarHidden = NO;
}
- (void)clickDestructiveButton
{
if (self.customActionDelegate
&& [self.customActionDelegate respondsToSelector:@selector(actionSheetDestructive:)]) {
[self.customActionDelegate actionSheetDestructive:self];
}
}
@end
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重新drawRect方法，可以去除UIActionSheet的默認樣式，然后通過addSubView方法添加定制的視圖。
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