NSUserdefaults 对象存储&nbs…
2016-02-26 17:03
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NSUserDefaults适合存储轻量级本地数据,比如要保存用户登陆的用户名、密码,使用NSUserDefaults是首选。下次再登陆的时候就可以直接从NSUserDefaults里面读取上次登陆的信息。
NSUserDefaults支持的数据格式有:NSNumber(Integer、Float、Double),NSString,NSDate,NSArray,NSDictionary,BOOL类型。
NSUserDefaults,读取方便,容易。下面给出一个示例看看如何使用:
Cpp代码 :
//保存数据到NSUserDefaults
-(void)saveNSUserDefaults
{
NSString *myString = @"enuola";
int myInteger = 100;
float myFloat = 50.0f;
double myDouble = 20.0;
NSDate *myDate = [NSDate date];
NSArray *myArray = [NSArray arrayWithObjects:@"hello", @"world", nil];
NSDictionary *myDictionary = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"enuo", @"20", nil] forKeys:[NSArray arrayWithObjects:@"name", @"age", nil]];
//将上述数据全部存储到NSUserDefaults中
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//存储时,除NSNumber类型使用对应的类型外,其他的都是使用setObject:forKey:
[userDefaults setInteger:myInteger forKey:@"myInteger"];
[userDefaults setFloat:myFloat forKey:@"myFloat"];
[userDefaults setDouble:myDouble forKey:@"myDouble"];
[userDefaults setObject:myString forKey:@"myString"];
[userDefaults setObject:myDate forKey:@"myDate"];
[userDefaults setObject:myArray forKey:@"myArray"];
[userDefaults setObject:myDictionary forKey:@"myDictionary"];
//这里建议同步存储到磁盘中,但是不是必须的
[userDefaults synchronize];
}
//从NSUserDefaults中读取数据
-(void)readNSUserDefaults
{
NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults];
//读取数据到各个label中
//读取整型int类型的数据
NSInteger myInteger = [userDefaultes integerForKey:@"myInteger"];
txtInteger.text = [NSString stringWithFormat:@"%d",myInteger];
//读取浮点型float类型的数据
float myFloat = [userDefaultes floatForKey:@"myFloat"];
txtFloat.text = [NSString stringWithFormat:@"%f",myFloat];
//读取double类型的数据
double myDouble = [userDefaultes doubleForKey:@"myDouble"];
txtDouble.text = [NSString stringWithFormat:@"%f",myDouble];
//读取NSString类型的数据
NSString *myString = [userDefaultes stringForKey:@"myString"];
txtNSString.text = myString;
//读取NSDate日期类型的数据
NSDate *myDate = [userDefaultes valueForKey:@"myDate"];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
txtNSDate.text = [NSString stringWithFormat:@"%@",[df stringFromDate:myDate]];
//读取数组NSArray类型的数据
NSArray *myArray = [userDefaultes arrayForKey:@"myArray"];
NSString *myArrayString = [[NSString alloc] init];
for(NSString *str in myArray)
{
NSLog(@"str= %@",str);
myArrayString = [NSString stringWithFormat:@"%@ %@", myArrayString, str];
[myArrayString stringByAppendingString:str];
// [myArrayString stringByAppendingFormat:@"%@",str];
NSLog(@"myArrayString=%@",myArrayString);
}
txtNSArray.text = myArrayString;
//读取字典类型NSDictionary类型的数据
NSDictionary *myDictionary = [userDefaultes dictionaryForKey:@"myDictionary"];
NSString *myDicString = [NSString stringWithFormat:@"name:%@, age:%d",[myDictionary valueForKey:@"name"], [[myDictionary valueForKey:@"age"] integerValue]];
txtNSDictionary.text = myDicString;
}
用NSUserDefaults存储的数据下次程序运行的时候依然存在,其数据存储在应用程序内置的一个plist文件里,这个可以根据路径看到。比如说这个是你的程序沙盒位置
/UsersLibrary/Application
Support/iPhoneSimulator/4.1/Applicati*****/29788E40-AF47-45A0-8E92-3AC0F501B7F4/,(这个是应用程序对应在mac上的位置)
这个下面有/Library/Prefereces,里面有个plist文件,存储的就是你的userDefaults,想要删掉的话,用removeObjectForKey或者删掉沙盒,也就是你的应用程序然后重新安装。
自定义对象:
.h文件
Objective-c代码
#import
@interface MyObject : NSObject
{
NSNumber* lowValue;
NSNumber* highValue;
NSString* titleString;
}
@property(nonatomic, retain)NSNumber* lowValue;
@property(nonatomic, retain)NSNumber* highValue;
@property(nonatomic, retain)NSString* titleString;
@end
.m文件:
Objective-c代码
#import "MyObject.h"
@implementation MyObject
@synthesize lowValue, highValue, titleString;
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:self.lowValue forKey:@"lowValue"];
[encoder encodeObject:self.highValue forKey:@"highValue"];
[encoder encodeObject:self.titleString forKey:@"titleString"];
}
- (id)initWithCoder:(NSCoder *)decoder
{
if(self = [super init])
{
self.lowValue = [decoder decodeObjectForKey:@"lowValue"];
self.highValue = [decoder decodeObjectForKey:@"highValue"];
self.titleString = [decoder decodeObjectForKey:@"titleString"];
}
return self;
}
@end
保存单个MyObject方法:
Objc代码
- (void)saveCustomObject:(MyObject *)obj
{
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:myEncodedObject forKey:@"myEncodedObjectKey"];
}
- (MyObject *)loadCustomObjectWithKey:(NSString *)key
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *myEncodedObject = [defaults objectForKey:key];
MyObject *obj = (MyObject *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject];
return obj;
}
保存:
MyObject* testObj = [[MyObject alloc] init];
testObj.lowValue =[NSNumber numberWithFloat:122.2 ];
testObj.highValue = [NSNumber numberWithFloat:19888 ];
testObj.titleString = @“baoyu”;
读取:
MyObject* obj = [self loadCustomObjectWithKey:@"myEncodedObjectKey"];
NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString);
保存多个MyObject方法:
Objc代码
保存:
NSMutableArray* array = [[NSMutableArray alloc] init];
for(int i=0; i<<span
class="number" style="color: rgb(192, 0,
0);">3; i++)
{
MyObject* testObj = [[MyObject alloc] init];
testObj.lowValue =[NSNumber numberWithFloat:122.2+i ];
testObj.highValue = [NSNumber numberWithFloat:19888+i ];
testObj.titleString = [NSString stringWithFormat:@"BAOYU%d", i];
[array addObject:testObj];
}
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:array] forKey:@"myarray"];
读取:
NSData* data = [[NSUserDefaults standardUserDefaults] objectForKey:@"myarray"];
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];
for(MyObject* obj in oldSavedArray)
{
NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString);
}
NSUserDefaults支持的数据格式有:NSNumber(Integer、Float、Double),NSString,NSDate,NSArray,NSDictionary,BOOL类型。
NSUserDefaults,读取方便,容易。下面给出一个示例看看如何使用:
Cpp代码 :
//保存数据到NSUserDefaults
-(void)saveNSUserDefaults
{
NSString *myString = @"enuola";
int myInteger = 100;
float myFloat = 50.0f;
double myDouble = 20.0;
NSDate *myDate = [NSDate date];
NSArray *myArray = [NSArray arrayWithObjects:@"hello", @"world", nil];
NSDictionary *myDictionary = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"enuo", @"20", nil] forKeys:[NSArray arrayWithObjects:@"name", @"age", nil]];
//将上述数据全部存储到NSUserDefaults中
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//存储时,除NSNumber类型使用对应的类型外,其他的都是使用setObject:forKey:
[userDefaults setInteger:myInteger forKey:@"myInteger"];
[userDefaults setFloat:myFloat forKey:@"myFloat"];
[userDefaults setDouble:myDouble forKey:@"myDouble"];
[userDefaults setObject:myString forKey:@"myString"];
[userDefaults setObject:myDate forKey:@"myDate"];
[userDefaults setObject:myArray forKey:@"myArray"];
[userDefaults setObject:myDictionary forKey:@"myDictionary"];
//这里建议同步存储到磁盘中,但是不是必须的
[userDefaults synchronize];
}
//从NSUserDefaults中读取数据
-(void)readNSUserDefaults
{
NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults];
//读取数据到各个label中
//读取整型int类型的数据
NSInteger myInteger = [userDefaultes integerForKey:@"myInteger"];
txtInteger.text = [NSString stringWithFormat:@"%d",myInteger];
//读取浮点型float类型的数据
float myFloat = [userDefaultes floatForKey:@"myFloat"];
txtFloat.text = [NSString stringWithFormat:@"%f",myFloat];
//读取double类型的数据
double myDouble = [userDefaultes doubleForKey:@"myDouble"];
txtDouble.text = [NSString stringWithFormat:@"%f",myDouble];
//读取NSString类型的数据
NSString *myString = [userDefaultes stringForKey:@"myString"];
txtNSString.text = myString;
//读取NSDate日期类型的数据
NSDate *myDate = [userDefaultes valueForKey:@"myDate"];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
txtNSDate.text = [NSString stringWithFormat:@"%@",[df stringFromDate:myDate]];
//读取数组NSArray类型的数据
NSArray *myArray = [userDefaultes arrayForKey:@"myArray"];
NSString *myArrayString = [[NSString alloc] init];
for(NSString *str in myArray)
{
NSLog(@"str= %@",str);
myArrayString = [NSString stringWithFormat:@"%@ %@", myArrayString, str];
[myArrayString stringByAppendingString:str];
// [myArrayString stringByAppendingFormat:@"%@",str];
NSLog(@"myArrayString=%@",myArrayString);
}
txtNSArray.text = myArrayString;
//读取字典类型NSDictionary类型的数据
NSDictionary *myDictionary = [userDefaultes dictionaryForKey:@"myDictionary"];
NSString *myDicString = [NSString stringWithFormat:@"name:%@, age:%d",[myDictionary valueForKey:@"name"], [[myDictionary valueForKey:@"age"] integerValue]];
txtNSDictionary.text = myDicString;
}
用NSUserDefaults存储的数据下次程序运行的时候依然存在,其数据存储在应用程序内置的一个plist文件里,这个可以根据路径看到。比如说这个是你的程序沙盒位置
/UsersLibrary/Application
Support/iPhoneSimulator/4.1/Applicati*****/29788E40-AF47-45A0-8E92-3AC0F501B7F4/,(这个是应用程序对应在mac上的位置)
这个下面有/Library/Prefereces,里面有个plist文件,存储的就是你的userDefaults,想要删掉的话,用removeObjectForKey或者删掉沙盒,也就是你的应用程序然后重新安装。
使用NSUserDefaults保存自定义对象
自定义对象:.h文件
Objective-c代码
#import
@interface MyObject : NSObject
{
NSNumber* lowValue;
NSNumber* highValue;
NSString* titleString;
}
@property(nonatomic, retain)NSNumber* lowValue;
@property(nonatomic, retain)NSNumber* highValue;
@property(nonatomic, retain)NSString* titleString;
@end
.m文件:
Objective-c代码
#import "MyObject.h"
@implementation MyObject
@synthesize lowValue, highValue, titleString;
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:self.lowValue forKey:@"lowValue"];
[encoder encodeObject:self.highValue forKey:@"highValue"];
[encoder encodeObject:self.titleString forKey:@"titleString"];
}
- (id)initWithCoder:(NSCoder *)decoder
{
if(self = [super init])
{
self.lowValue = [decoder decodeObjectForKey:@"lowValue"];
self.highValue = [decoder decodeObjectForKey:@"highValue"];
self.titleString = [decoder decodeObjectForKey:@"titleString"];
}
return self;
}
@end
保存单个MyObject方法:
Objc代码
- (void)saveCustomObject:(MyObject *)obj
{
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:myEncodedObject forKey:@"myEncodedObjectKey"];
}
- (MyObject *)loadCustomObjectWithKey:(NSString *)key
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *myEncodedObject = [defaults objectForKey:key];
MyObject *obj = (MyObject *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject];
return obj;
}
保存:
MyObject* testObj = [[MyObject alloc] init];
testObj.lowValue =[NSNumber numberWithFloat:122.2 ];
testObj.highValue = [NSNumber numberWithFloat:19888 ];
testObj.titleString = @“baoyu”;
读取:
MyObject* obj = [self loadCustomObjectWithKey:@"myEncodedObjectKey"];
NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString);
保存多个MyObject方法:
Objc代码
保存:
NSMutableArray* array = [[NSMutableArray alloc] init];
for(int i=0; i<<span
class="number" style="color: rgb(192, 0,
0);">3; i++)
{
MyObject* testObj = [[MyObject alloc] init];
testObj.lowValue =[NSNumber numberWithFloat:122.2+i ];
testObj.highValue = [NSNumber numberWithFloat:19888+i ];
testObj.titleString = [NSString stringWithFormat:@"BAOYU%d", i];
[array addObject:testObj];
}
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:array] forKey:@"myarray"];
读取:
NSData* data = [[NSUserDefaults standardUserDefaults] objectForKey:@"myarray"];
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];
for(MyObject* obj in oldSavedArray)
{
NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString);
}
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