Object-c 学习笔记

数字类型Numbers

NSArray *a = [NSArray arrayWithObjects:
[NSNumber numberWithUnsignedLongLong:ULLONG_MAX],
[NSNumber numberWithInt: -2],
[NSNumber numberWithFloat: 300.057],
[NSNumber numberWithInt: 1],
[NSNumber numberWithDouble: 200.0123],
[NSNumber numberWithLongLong: LLONG_MIN],nil];
NSArray *sorted = [a sortedArrayUsingSelector: @selector(compare:)];
NSLog(@"%@", sorted);

NSDecimalNumber *one = [NSDecimalNumber one];
NSDecimalNumber *fortyTwo =[NSDecimalNumber decimalNumberWithString: @"42"];
NSDecimalNumber *sum = [one decimalNumberByAdding: fortyTwo];
NSDecimal accumulator = [sum decimalValue];
NSDecimal temp = [fortyTwo decimalValue];
NSDecimalMultiply(&accumulator, &accumulator, &temp, NSRoundPlain);
temp = [one decimalValue];
NSDecimalAdd(&accumulator, &accumulator, &temp,NSRoundPlain);
NSDecimalNumber *result =[NSDecimalNumber decimalNumberWithDecimal:accumulator];

int num = [@"43" intValue];

字符串Manipulation Strings

集合 Collections

日期和时间 Date and Time

属性列表 Property Lists

健值对 Key-Value

文件处理 Files

线程 Thread