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如何在objective-c中将NSMutableArray转换为NSArray ？

我正在开发iphone应用程序.

我使用NSCoder.

MyApplication.h

#define ITEMS_KEY @"items"
#define CATEGORIES_KEY @"categories"


#import <UIKit/UIKit.h>


@interface MyApplicationData : NSObject <NSCoding, NSCopying> {
    NSMutableArray* items;
    NSMutableArray* categories;
}

@property (nonatomic ,retain) NSMutableArray* items;
@property (nonatomic, retain) NSMutableArray* categories;


@end

Myapplication.m

#import "MyApplicationData.h"


@implementation MyApplicationData

@synthesize items;
@synthesize categories;

#pragma mark NSCoding
- (void)encodeWithCoder:(NSCoder *)aCoder{
  [aCoder encodeObject:items forKey:ITEMS_KEY];
  [aCoder encodeObject:categories forKey:CATEGORIES_KEY];
}

-(id)initWithCoder:(NSCoder *)aDecoder{
  if(self = [super init]){
    self.items = [aDecoder decodeObjectForKey:ITEMS_KEY];
    self.categories = [aDecoder decodeObjectForKey:CATEGORIES_KEY];
  }
  return self;
}

#pragma mark -
#pragma mark NSCopying …

如何修剪NSMutableString中的""和"\n"？

我想在选择表格单元格时显示Web视图

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
  [uiWebView loadRequest:[NSURL URLWithString:@"http://www.google.com"]];

  [self.navigationController pushNavigationItem:uiWebView animated:YES];
}

日志

-[UINavigationController pushNavigationItem:animated:]: unrecognized selector sent to instance

NSString str = xxxxx;
[str length];

此代码是字符数.

我想获得字节数.

appdata.items是NSMutableArray.

我不能编译这段代码.错误代码是"prop.173具有不完整类型".

NSInteger compareInfo(id aInfo1, id aInfo2, void *context){
  NSDate* info1 = [aInfo1 objectAtIndex:2];
  NSDate* info2 = [aInfo2 objectAtIndex:2];
  return [info1 compare:info2];
}

-(void)saveData{
  NSData* data = [[NSMutableData alloc] init];
  appdata.items = [appdata.items sortUsingFunction:compareInfo context:NULL];
  NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
  [archiver encodeObject:appdata forKey:DATAKEY];
  [archiver finishEncoding];
  [data writeToFile:[self dataFilePath] atomically:YES];
  [archiver release];
  [data release];
}

Objective-C的

Conflict types for '-(NSInteger)amountYear:(NSInteger)searchYear Month:(NSInteger)searchMonth'

我怎么能摆脱这个警告？

.M

#import "MyAppDataController.h"
#import "MyApplicationData.h"

@implementation MyAppDataController

@synthesize appdata;

static id _instance = nil;

+ (id)instance
{
  @synchronized(self) {
    if (!_instance) {
      _instance = [[MyAppDataController alloc] init];
    }
  }
  return _instance;
}

+ (id)allocWithZone:(NSZone*)zone
{
  @synchronized(self) {
    if (!_instance) {
      _instance = [super allocWithZone:zone];
      return _instance;
    }
  }
  return nil;
}

- (id)copyWithZone:(NSZone*)zone
{
  return self;
}

- (id)retain
{
  return self;
}

- (unsigned)retainCount
{
  return UINT_MAX;
}

- (void)release
{
} …

此功能执行得不好.

-(void)sampleItemA:(NSString*)a itemB:(NSString*)b itemC:(NSDate*)c{
    NSLog(@"A");
    NSArray* ary = [[NSArray alloc] initWithObjects:a, b, c, nil];
    NSLog([ary description]);
    NSLog(@"B");
}

日志

[Session started at 2009-11-07 20:46:10 +0900.]
2009-11-07 20:46:19.170 xxx[2374:207] A

原因是什么？

编辑:

我试过了.但它没有执行.

-(void)sampleItemA:(NSString*)a itemB:(NSString*)b itemC:(NSDate*)c{
    NSLog(@"A");
    NSArray* ary = [[NSArray alloc] initWithObjects:a, b, c, nil];
    NSLog(@"%@", [ary description]);
    NSLog(@"B");
}

日志

[Session started at 2009-11-07 21:25:37 +0900.]
2009-11-07 21:25:48.738 xxx[2455:207] A