以下是AtomRiot建議的解決方案的變體。
在您的視圖(xib或storyboard)上創建一個按鈕並將其分配給它。如果它出現在編輯器中,請不要擔心。該代碼將使其成爲可實現的圖形。
2X版本
然後在您的項目(以下複製)下列文件:
DDLBHelper.h DDLBHelper.m
然後在你的ViewController的。.h文件生成鏈接到該按鈕:
@property (weak, nonatomic) IBOutlet UIButton *ddlbB;
- (IBAction)ddlbBClick:(id)sender;
在你的ViewController的.m文件進行以下電話:
@synthesize ddlbB, choiceLabel;
DDLBHelper *mDDLBH;
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *strings = [[NSArray alloc] initWithObjects:@"Item 1", @"Item 2", @"Item 3", nil];
mDDLBH = [[DDLBHelper alloc] initWithWithViewController:self button:ddlbB stringArray:strings currentValue:1];
}
- (IBAction)ddlbBClick:(id)sender {
[mDDLBH popupList];
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
[mDDLBH adjustToRotation];
}
作品就像機器人。
以下是文件:
DDLBHelper.h
// DDLBHelper.h
// Created by MindSpiker on 9/27/12.
#import <Foundation/Foundation.h>
@protocol DDLBHelperDelegate <NSObject>
@required
- (void) itemSelected: (int)value;
@end
@interface DDLBHelper : UIViewController <UITableViewDelegate, UITableViewDataSource>{
id <DDLBHelperDelegate> delegate;
}
@property (retain) id delegate;
// external interface
- (id) init;
- (id) initWithWithViewController:(UIViewController *)viewController button:(UIButton *)button stringArray:(NSArray *)values currentValue:(int) currentValue;
- (void) popupList;
- (BOOL) isShown;
- (void) adjustToRotation;
- (int) getValue;
- (NSString *)getValueText;
@end
DDLBHelper.m
// DDLBHelper.m
// Created by MindSpiker on 9/27/12.
#import "DDLBHelper.h"
#import <QuartzCore/QuartzCore.h>
@interface DDLBHelper() {
@private
UIViewController *mVC;
UIButton *mButton;
NSArray *mValues;
int mValue;
UITableView *mTV;
UIView *mBackgroundV;
}
@end
@implementation DDLBHelper
@synthesize delegate;
- (id) init {
self = [super init];
mVC = nil;
mButton = nil;
mValues = nil;
mValue = -1;
return self;
}
- (id) initWithWithViewController:(UIViewController *)viewController button:(UIButton *)button stringArray:(NSArray *)values currentValue:(int) currentValue {
self = [super init];
// save pointers
mVC = viewController;
mButton = button;
mValues = values;
mValue = currentValue;
[self setupButton];
return self;
}
- (void) popupList{
if (mBackgroundV == nil){
mBackgroundV = [self setupBackgroundView];
[mVC.view addSubview:mBackgroundV];
}
if (mTV == nil){
mTV = [self setupTableView];
[mVC.view addSubview:mTV];
}
[mTV reloadData];
[mBackgroundV setHidden:NO];
[mTV setHidden:NO];
}
- (BOOL) isShown{
return !mTV.isHidden;
}
- (void) adjustToRotation{
BOOL isShown = [self isShown];
// remove the controls
if (mBackgroundV != nil){
[mBackgroundV removeFromSuperview];
mBackgroundV = nil;
}
if (mTV != nil){
[mTV removeFromSuperview];
mTV = nil;
}
if (isShown){
[self popupList];
}
}
- (int) getValue{
return mValue;
}
- (NSString *) getValueText{
if (mValues != nil && mValue > -1) {
if (mValues.count > mValue){
return [mValues objectAtIndex:mValue];
}
}
return nil;
}
- (void) updateButtonTitle{
NSString *title = [NSString stringWithFormat:@" %@", [self getValueText]];
[mButton setTitle:title forState:UIControlStateNormal];
}
- (void) setupButton {
UIImage *buttonBG = [UIImage imageNamed:@"sis_proceeds_ddlb.png"];
UIEdgeInsets insets = UIEdgeInsetsMake(8, 8, 8, 45);
UIImage *sizableImg = [buttonBG resizableImageWithCapInsets:insets];
[mButton setBackgroundImage:sizableImg forState:UIControlStateNormal];
[mButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
[self updateButtonTitle];
}
- (UIView *) setupBackgroundView{
UIView *v = [[UIView alloc] initWithFrame:mVC.view.bounds];
[[v layer] setOpaque:NO];
[[v layer] setOpacity:0.7f];
[[v layer] setBackgroundColor:[UIColor blackColor].CGColor];
return v;
}
- (UITableView *) setupTableView {
CGRect rect = [self makeTableViewRect];
UITableView *tv = [[UITableView alloc] initWithFrame:rect style:UITableViewStylePlain];
[tv setDelegate:self];
[tv setDataSource:self];
[tv setBackgroundColor:[UIColor whiteColor]];
[[tv layer] setBorderWidth:2];
[[tv layer] setBorderColor:[UIColor lightGrayColor].CGColor];
[[tv layer] setCornerRadius:10];
[mVC.view addSubview:tv];
return tv;
}
- (CGRect) makeTableViewRect {
float l=0.0, t=0.0, w=0.0, h=0.0, maxH=0.0, cellH=0.0, cellsH=0.0;
// get
l = mButton.frame.origin.x;
w = mButton.frame.size.width;
t = mVC.view.bounds.origin.y + 50;
maxH = mVC.view.bounds.size.height - 100;
// get cell height
UITableViewCell *c = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
cellH = c.bounds.size.height;
// see if list will overlow maxH(eight)
cellsH = cellH * mValues.count;
if (cellsH > maxH) {
h = maxH;
} else {
h = cellsH;
}
return CGRectMake(l, t, w, h);
}
#pragma mark - TableView Delegate functions
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1; // this is a one section table
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return mValues.count; // should be called for only one section
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
// try to resuse a cell if possible
static NSString *RESUSE_IDENTIFIER = @"myResuseIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:RESUSE_IDENTIFIER];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:RESUSE_IDENTIFIER];
}
cell.textLabel.text = [mValues objectAtIndex:indexPath.row];
if (mValue == indexPath.row){
cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
// save value and hide view
mValue = indexPath.row;
[self updateButtonTitle];
[mBackgroundV setHidden:YES];
[mTV setHidden:YES];
[delegate itemSelected:mValue];
}
@end
難道使用得到一個按鈕和一個字符串數組初始化一個自定義的UIViewController文件類似的東西。然後它將裝飾按鈕看起來像一個下拉列表框(組合框)並處理文本顯示。當按下的代碼調用一個彈出方法來處理剩下的事情。代碼包含在下面的答案中。 – MindSpiker