Ojbect-C2 1、NSNumber数字的使用

1、

Creating an NSNumber Object

• + numberWithBool:
• + numberWithChar:
• + numberWithDouble:
• + numberWithFloat:
• + numberWithInt:
• + numberWithInteger:
• + numberWithLong:
• + numberWithLongLong:
• + numberWithShort:
• + numberWithUnsignedChar:
• + numberWithUnsignedInt:
• + numberWithUnsignedInteger:
• + numberWithUnsignedLong:
• + numberWithUnsignedLongLong:
• + numberWithUnsignedShort:

Initializing an NSNumber Object

• – initWithBool:
• – initWithChar:
• – initWithDouble:
• – initWithFloat:
• – initWithInt:
• – initWithInteger:
• – initWithLong:
• – initWithLongLong:
• – initWithShort:
• – initWithUnsignedChar:
• – initWithUnsignedInt:
• – initWithUnsignedInteger:
• – initWithUnsignedLong:
• – initWithUnsignedLongLong:
• – initWithUnsignedShort:

Accessing Numeric Values

• – boolValue
• – charValue
• – decimalValue
• – doubleValue
• – floatValue
• – intValue
• – integerValue
• – longLongValue
• – longValue
• – shortValue
• – unsignedCharValue
• – unsignedIntegerValue
• – unsignedIntValue
• – unsignedLongLongValue
• – unsignedLongValue
• – unsignedShortValue

Retrieving String Representations

• – descriptionWithLocale:
• – stringValue

Comparing NSNumber Objects

• – compare:
• – isEqualToNumber:

Accessing Type Information

• – objCType