每次进入 UITableView 时,我都想向我的数组中添加一个新对象。问题是当我从这个视图出去时 UITableView 会被释放,所以我不能在 UITableView 类中声明我的数组。
我创建了一个名为“array”的新 NSObject 类,但我不知道如何使用它。
数组.h
#import <Foundation/Foundation.h>
@interface Array : NSObject
{
NSMutableArray *tableau;
}
@property (strong) NSMutableArray* tableau;
- (id)initWithName:(NSMutableArray *)atableau ;
- (NSMutableArray*) tableau;
- (void) setTableau:(NSMutableArray*) newTableau;
+(Tableau*)instance;
@end
数组.m
#import "Array.h"
@implementation Array
- (id)initWithName:(NSMutableArray *)atableau {
if ((self = [super init]))
{
self.tableau = atableau;
}
return self;
}
- (NSMutableArray*) tableau{
return tableau;
}
- (void) setTableau:(NSMutableArray*) newTableau{
tableau = newTableau;
}
+(Tableau*)instance{
static dispatch_once_t once;
static Array *sharedInstance;
dispatch_once(&once, ^{
sharedInstance = [[self alloc] initWithName:@"jean" ];
});
return sharedInstance;
}
@end
UITableViewController.m
...
- (void)viewDidAppear:(BOOL)animated
{
if (![[Array instance] tableau]) {
}
[[[Array instance]tableau]addObject:@"koko"];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
NSLog(@"appear");
}
...
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[[[Array instance] tableau] removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
...
当我这样做时,我得到了这个错误:
'NSInvalidArgumentException',原因:'-[__NSCFConstantString addObject:]:无法识别的选择器发送到实例 0x5aa4'
感谢您未来的回复。