// 聊聊NSNumber， NSNumber可以封裝c中基本數據類型 char，int，long，float，BOOL，NSInteger，CGFloat等。
NSNumber *num = [NSNumber numberWithChar:'a'];
NSLog(@"%@", num); // 97
num = [NSNumber numberWithInteger:97];
num = [NSNumber numberWithFloat:97.0];
num = [NSNumber numberWithBool:YES];
// 不過直接用下面的方式封裝會更方便
num = @'a';
num = @97;
num = @97.0;
num = @YES;
// 既然NSNumber能封裝BOOL，NSInteger，CGFloat等基礎數據格式，那如何判斷NSNumber是什麼基礎類型呢，接着看
/*
+ (NSNumber *)numberWithChar:(char)value;
+ (NSNumber *)numberWithUnsignedChar:(unsigned char)value;
+ (NSNumber *)numberWithShort:(short)value;
+ (NSNumber *)numberWithUnsignedShort:(unsigned short)value;
+ (NSNumber *)numberWithInt:(int)value;
+ (NSNumber *)numberWithUnsignedInt:(unsigned int)value;
+ (NSNumber *)numberWithLong:(long)value;
+ (NSNumber *)numberWithUnsignedLong:(unsigned long)value;
+ (NSNumber *)numberWithLongLong:(long long)value;
+ (NSNumber *)numberWithUnsignedLongLong:(unsigned long long)value;
+ (NSNumber *)numberWithFloat:(float)value;
+ (NSNumber *)numberWithDouble:(double)value;
+ (NSNumber *)numberWithBool:(BOOL)value;
+ (NSNumber *)numberWithInteger:(NSInteger)value NS_AVAILABLE(10_5, 2_0);
+ (NSNumber *)numberWithUnsignedInteger:(NSUInteger)value NS_AVAILABLE(10_5, 2_0);
*/
num = [NSNumber numberWithChar:'a'];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber c
num = [NSNumber numberWithUnsignedChar:'a'];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber s
num = [NSNumber numberWithShort:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber s
num = [NSNumber numberWithUnsignedShort:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i
num = [NSNumber numberWithInt:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i
num = [NSNumber numberWithUnsignedInt:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q
num = [NSNumber numberWithLong:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i
num = [NSNumber numberWithUnsignedLong:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q
num = [NSNumber numberWithLongLong:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q
num = [NSNumber numberWithUnsignedLongLong:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q
num = [NSNumber numberWithFloat:1.2];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber f
num = [NSNumber numberWithDouble:1.2];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber d
num = [NSNumber numberWithBool:YES];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFBoolean c
num = [NSNumber numberWithInteger:97];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i
num = [NSNumber numberWithUnsignedInteger:YES];
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i
// num.objCType 代表類型編碼@encode(type-name)
// 這樣就看出來了，判斷整型int類，包括short, unsigned short, int, unsigned int, long, unsigned long, long long, unsigned long long，就這樣判斷
NSArray *intTypeArray = @[@"s", @"i", @"q"];
NSString *intType = [NSString stringWithFormat:@"%s", num.objCType];
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [intTypeArray containsObject:intType]) {
NSLog(@"%@是一個整數", num);
}
// 浮點型判斷
NSArray *floatTypeArray = @[@"f", @"d"];
NSString *floatType = [NSString stringWithFormat:@"%s", num.objCType];
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [floatTypeArray containsObject:floatType]) {
NSLog(@"%@是一個浮點型", num);
}
// char判斷
NSArray *charTypeArray = @[@"c"];
NSString *charType = [NSString stringWithFormat:@"%s", num.objCType];
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [charTypeArray containsObject:charType]) {
NSLog(@"%@是一個字符型", num);
}
// BOOL判斷
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFBoolean"]) {
NSLog(@"%@是一個字符型", num);
}
if ([num isKindOfClass:NSClassFromString(@"__NSCFBoolean")]) {
NSLog(@"num is BOOL type");
} else {
NSLog(@"num is not BOOL type");
}
// 下面聊NSNumberFormatter
// 從學號談起，一般學號的全格式是 入學年份（前兩位）+大學(學院)代碼+專業代碼+班級+個人班級學號 05+01+02+1+01，給班級學生列成績單，知道學生班級學號，生成學校學號，如5號，應該生成050102105，我們想到的方法是c中的格式化，例如：
NSInteger classCode = 5;
NSString *schoolStuCode = [NSString stringWithFormat:@"0501021%2.2d", classCode];
NSLog(@"schoolStuCode = %@", schoolStuCode); // 050102105
// 另一種方法是NSNumberFormatter轉換，上代碼
// 數據格式轉換類
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
numberFormatter.numberStyle = kCFNumberFormatterNoStyle;
numberFormatter.formatWidth = 2; // 數據寬度爲2，不足前面補0
numberFormatter.paddingCharacter = @"0";
schoolStuCode = [NSString stringWithFormat:@"0501021%@", [numberFormatter stringFromNumber:@(classCode)]];
NSLog(@"schoolStuCode = %@", schoolStuCode); // 050102105
// 這裏也輸出了050102105
// 之後體驗NSNumberFormatter強大功能
// 字符串分隔，可用於手機號顯示
NSString *formatterStr;
numberFormatter.numberStyle = kCFNumberFormatterDecimalStyle;
formatterStr = [numberFormatter stringFromNumber:@102140302];
NSLog(@"%@", formatterStr); // 102,140,302
// 從格式字符串轉換爲數據，其他類似
NSNumber *number = [numberFormatter numberFromString:formatterStr];
NSLog(@"number = %@", number);
// 貨幣符號
numberFormatter.numberStyle = NSNumberFormatterCurrencyStyle;
formatterStr = [numberFormatter stringFromNumber:@1.2];
NSLog(@"%@", formatterStr); // $1.20
// 百分數格式
numberFormatter.numberStyle = kCFNumberFormatterPercentStyle;
formatterStr = [numberFormatter stringFromNumber:@1.2];
NSLog(@"%@", formatterStr); // 120%
// 科學計數格式
numberFormatter.numberStyle = kCFNumberFormatterScientificStyle;
formatterStr = [numberFormatter stringFromNumber:@1.2];
NSLog(@"%@", formatterStr); // 1.2E0
// 口語格式
numberFormatter.numberStyle = kCFNumberFormatterSpellOutStyle;
formatterStr = [numberFormatter stringFromNumber:@1.2];
NSLog(@"%@", formatterStr); // one point two
