在NSUserDefault中將自定義對象存儲在NSMutableArray中我最近一直在嘗試將我的iPhone應(yīng)用程序的搜索結(jié)果存儲在NSUserDefaults集合中。我還使用它成功地保存了用戶注冊信息，但出于某種原因，試圖存儲我的自定義位置類的NSMutableArray始終是空的。在本文中，我嘗試將NSMutableArray轉(zhuǎn)換為NSData元素，但得到了相同的結(jié)果(是否可以在iPhone上使用NSUserDefault保存整數(shù)數(shù)組？)我嘗試過的代碼示例如下：保留：[prefs setObject:results forKey:@"lastResults"];[prefs synchronize];或NSData *data = [NSData dataWithBytes:&results length:sizeof(results)];[prefs setObject:data forKey:@"lastResults"];或NSData *data = [NSKeyedArchiver archivedDataWithRootObject:results];[prefs setObject:data forKey:@"lastResults"];負(fù)載：lastResults = (NSMutableArray *)[prefs objectForKey:@"lastResults"];或NSData *data = [prefs objectForKey:@"lastResults"];memcpy(&lastResults, data.bytes, data.length);或NSData *data = [prefs objectForKey:@"lastResults"];lastResults = [NSKeyedUnarchiver unarchiveObjectWithData:data];在以下建議之后，我還在我的對象中實(shí)現(xiàn)了NSCoder(忽略對NSString臨時的過度使用)：#import "Location.h"@implementation Location@synthesize locationId;@synthesize companyName;@synthesize addressLine1;
@synthesize addressLine2;@synthesize city;@synthesize postcode;@synthesize telephoneNumber;@synthesize description;
@synthesize rating;@synthesize priceGuide;@synthesize latitude;@synthesize longitude;@synthesize userLatitude;
@synthesize userLongitude;@synthesize searchType;@synthesize searchId;
@synthesize distance;@synthesize applicationProviderId;@synthesize contentProviderId;- (id) initWithCoder: (NSCoder *)coder{
if (self = [super init])
{
self.locationId = [coder decodeObjectForKey:@"locationId"];
self.companyName = [coder decodeObjectForKey:@"companyName"];
self.addressLine1 = [coder decodeObjectForKey:@"addressLine1"];
self.addressLine2 = [coder decodeObjectForKey:@"addressLine2"];
self.city = [coder decodeObjectForKey:@"city"];
self.postcode = [coder decodeObjectForKey:@"postcode"];
self.telephoneNumber = [coder decodeObjectForKey:@"telephoneNumber"];
self.description = [coder decodeObjectForKey:@"description"];
3 回答
慕森王
TA貢獻(xiàn)1777條經(jīng)驗(yàn) 獲得超3個贊
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:@"savedArray"];if (dataRepresentingSavedArray != nil){
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
if (oldSavedArray != nil)
objectArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
else
objectArray = [[NSMutableArray alloc] init];}[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:objectArray] forKey:@"savedArray"];
- (void)encodeWithCoder:(NSCoder *)coder;{
[coder encodeObject:label forKey:@"label"];
[coder encodeInteger:numberID forKey:@"numberID"];}- (id)initWithCoder:(NSCoder *)coder;{
self = [super init];
if (self != nil)
{
label = [[coder decodeObjectForKey:@"label"] retain];
numberID = [[coder decodeIntegerForKey:@"numberID"] retain];
}
return self;}
叮當(dāng)貓咪
TA貢獻(xiàn)1776條經(jīng)驗(yàn) 獲得超12個贊
lastResults = [prefs arrayForKey:@"lastResults"];
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