Question

我想要的是使用现有CNContact对象的属性生成子联系人。我从CNContact获取了CNContactPickerViewController对象，并在tableview中显示所有属性。

tableviewcell嵌入了switch。我在导航项目上有一个预览按钮，当按下按钮时，如果属性中的开关打开，则此属性应存储在新的CNMutableContact中。

我的问题是：如果联系人的属性太多，我就无法保存屏幕外属性。有没有办法解决这个问题。

获得子联系的部分代码：

+(CNMutableContact*)newContactWithSelectedFieldInTableView:(UITableView*)tableView FromContact:(CNContact*)contact

{ CNMutableContact* aContact = [[CNMutableContact alloc]init];

//get all indexPath from tableview
NSMutableArray* indexPathArr = [[NSMutableArray alloc]init];
NSInteger nSections = [tableView numberOfSections];
for (int j=0; j<nSections; j++) {
    NSInteger nRows = [tableView numberOfRowsInSection:j];
    for (int i=0; i<nRows; i++) {
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:j];
        [indexPathArr addObject:indexPath];
    }
}
//selected phone numbers
//go through indexPath
for (NSIndexPath* path in indexPathArr)
{
    UITableViewCell* nameCell = [tableView cellForRowAtIndexPath:path];
    UISwitch *mySwitch = (UISwitch *)nameCell.accessoryView;
    switch (path.section)
    {
        case basicInfoSection://basic info section (name,company,department,title)
        {
            int row = 0;
            if(path.row==row)
            {
                if(mySwitch.on)
                {
                    aContact.givenName = contact.givenName;
                    aContact.middleName = contact.middleName;
                    aContact.familyName = contact.familyName;
                }
            }
            if(![contact.organizationName isEqualToString:@""])
            {row += 1;
                if(path.row==row)//company row
                {
                    //store company
                    if(mySwitch.on)
                        aContact.organizationName = contact.organizationName;
                }
            }
            if(![contact.departmentName isEqualToString:@""])
            {row += 1;
                if(path.row==row)//department row
                {
                    //store department
                    if(mySwitch.on)
                        aContact.departmentName = contact.departmentName;
                }
            }
            if(![contact.jobTitle isEqualToString:@""])
            {row += 1;
                if(path.row==row)//jobTitle row
                {
                    //store job Title
                    if(mySwitch.on)
                        aContact.jobTitle = contact.jobTitle;
                }
            }
        }
            break;
        case phoneSection:
        {
            if(mySwitch.on)
            {
                aContact.phoneNumbers = [aContact.phoneNumbers arrayByAddingObject:contact.phoneNumbers[path.row]];
            }
        }
            break;

我想出了一个解决方案，现在工作正常，下面列出了一些代码：

1＃创建UISwitch的子类

#import <UIKit/UIKit.h>
@interface SwitchWithIndex : UISwitch
@property (strong ,nonatomic) NSIndexPath* indexPath;
@end

2＃创建一个字典，用于记录带有switch状态的indexPath，并在视图中根据需求tableview布局为所有可能的indexPath加载，循环数据源（CNContact）。

for(NSInteger section=0; section<7; section++)
{
    switch (section) {
        {
            //section 1 basic info(name, company, department, job title)
        case basicInfoSection:
            {int row =0;
                NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                [_switchStateAtIndex setObject:boolNumber forKey:indexPath];

                if(![_contact.organizationName isEqualToString:@""])
                {row += 1;
                    NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                    [_switchStateAtIndex setObject:boolNumber forKey:indexPath];
                }
                if(![_contact.departmentName isEqualToString:@""])
                {row += 1;
                    NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                    [_switchStateAtIndex setObject:boolNumber forKey:indexPath];
                }
                if(![_contact.jobTitle isEqualToString:@""])
                {row += 1;
                    NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                    [_switchStateAtIndex setObject:boolNumber forKey:indexPath];
                }
            }
            break;

            //section 2 phones
        case phoneSection:
            {
                for(NSInteger row=0; row<[_contact.phoneNumbers count];row++)
                {
                    NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                    [_switchStateAtIndex setObject:boolNumber forKey:indexPath];
                }
            }
            break; 
 //more code ..

3＃在表视图中，Datasource Delegate在indexpath和

加载switch的状态

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
SwitchWithIndex* mySwitch = [[SwitchWithIndex alloc] init];
[mySwitch addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
NSNumber* switchStateNumber =[_switchStateAtIndex objectForKey:indexPath];
BOOL switchState = [switchStateNumber boolValue];
mySwitch.on = switchState;
mySwitch.indexPath = [[NSIndexPath alloc]init];
mySwitch.indexPath = indexPath;
cell.accessoryView = mySwitch;
//more code

和以下代码检测开关状态的变化。

- (void) switchChanged:(id)sender {

SwitchWithIndex* mySwitch = sender;

NSIndexPath* indexPath = mySwitch.indexPath;

NSLog(@"%@",indexPath);

NSNumber* switchStateBool = [NSNumber numberWithBool:mySwitch.on ? YES : NO];

[_switchStateAtIndex setObject:switchStateBool forKey:indexPath];

NSLog( @"The switch is %@", mySwitch.on ? @"ON" : @"OFF" );

}

4＃最后根据开关状态保存所选字段

+(CNMutableContact*)newContactFrom:(CNContact*)contact withSwitchState:(NSMutableDictionary*)switchState
{
  CNMutableContact* aContact = [[CNMutableContact alloc]init];

for (NSIndexPath* indexPath in switchState.keyEnumerator)
{
    NSNumber* boolNumber = [switchState objectForKey:indexPath];
    BOOL switchOn = [boolNumber boolValue];
    switch (indexPath.section) {
        case basicInfoSection://basic info section (name,company,department,title)
        {
            int row = 0;
            if(indexPath.row==row)
            {
                if(switchOn)
                {
                    aContact.givenName = contact.givenName;
                    aContact.middleName = contact.middleName;
                    aContact.familyName = contact.familyName;
                }
            }
            if(![contact.organizationName isEqualToString:@""])
            {row += 1;
                if(indexPath.row==row)//company row
                {
                    //store company
                    if(switchOn)
                        aContact.organizationName = contact.organizationName;
                }
            }
//more code

可能还有其他解决方案来解决这个问题，上面就是我现在可以做的事情。

Answer 1

您需要将交换机的状态存储在表视图单元格以外的其他位置，而不是枚举表视图中的所有单元格。我想这已经完成了，否则只需滚动表视图，开关的状态就不可靠/一致。

例如，在cellForRowAtIndexPath:方法中，您必须告诉单元格切换是否应显示为on或off。您可以通过在实例级数组中保存开关的状态来完成此操作。这是一种方法：

@interface YourClass ()
{
    // Create an instance-level array to store switch values.
    NSMutableArray *switchValues;
}

...

- (void)viewDidLoad {
    switchValues = [NSMutableArray new];
    for(int i = 0; i < YOUR_TABLE_SIZE; i++)
        [switchValues insertObject:[NSNumber numberWithBool:DEFAULT_SWITCH_STATE]];

    // Alternatively, populate your array with another data object if all the
    // switches do not have the same default starting state (on/off).
}

...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    YourCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier" forIndexPath:indexPath];

    ...

    // Add a target to the switch so we know when it toggles.
    [cell.toggleSwitch addTarget:self action:@selector(switchSwitched:) forControlEvents:UIControlEventValueChanged];
    cell.toggleSwitch.tag = indexPath.row;
    // Set the state to the appropriate value.
    cell.toggleSwitch.on = [[switchValues objectAtIndex:indexPath.row] boolValue];

    return cell;
}

- (void)switchSwitched:(UISwitch *)switcher
{
    // Toggle the switch's value in the instance array
    [switchValues replaceObjectAtIndex:switcher.tag withObject:[NSNumber numberWithBool:switcher.on]];
}

通过Tableview

1 个答案: