GitHub
介绍
提供 NNString， NSNumber 的 NSDecimalNumber 的计算及比较分类 ，通过链式调用简化数值计算。
使用
- 示例一：全部使用 NSNumber 计算
1
2
//( ( ( ( 3 - 2 + 5 ) × 3 ) × ( 10 × 2 ) ) ÷ 2 )
NSString *v = @(3).nn_sub(@(2)).nn_add(@(5)).nn_mul(@(3)).nn_mul(@(10).nn_mul(@(2))).nn_div(@(2));
- 示例二：全部使用 NSString 计算
1
2
//( ( ( ( 3 - 2 + 5 ) × 3 ) × ( 10 × 2 ) ) ÷ 2 )
NSString *v = @"3".nn_sub(@"2").nn_add(@"5").nn_mul(@"3").nn_mul(@"10".nn_mul(@"2")).nn_div(@"2");
- 示例三：使用 NSNumber 与 NSString 混合计算
1
2
//( ( ( ( 3 - 2 + 5 ) × 3 ) × ( 10 × 2 ) ) ÷ 2 )
NSString *v = @(3).nn_sub(@"2").nn_add(@(5)).nn_mul(@"3").nn_mul(@(10).nn_mul(@"2")).nn_div(@(2));
- 示例四：幂运算
1
2
3
4
5
6
7
8
{
//( ( 2 × 5 + ( 2 × 2 ) ) ^ 2 )
NSString *v = @"2".nn_mul(@(5)).nn_add(@"2".nn_mul(@"2")).nn_power(@(2));
}
{
//( ( 2 × 5 + ( 2 × 2 ) ) × 10 ^ 2 )
NSString *v = @(2).nn_mul(@"5").nn_add(@"2".nn_mul(@(2))).nn_mulPowerOf10(@(2));
}
- 示例五：数值比较
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NSString *v0 = @"100";
NSNumber *v1 = @(100.1);
if ([v0 nn_decimalIsEqualTo:v1]) {
NSLog(@"v0 == v1 : v0 = %@, v1 = %@", v0, v1);
}
else if ([v0 nn_decimalIsGreaterThan:v1]) {
NSLog(@"v0 > v1 : v0 = %@, v1 = %@", v0, v1);
}
else if ([v0 nn_decimalIsGreaterThanOrEqualTo:v1]) {
NSLog(@"v0 <= v1 : v0 = %@, v1 = %@", v0, v1);
}
else if ([v0 nn_decimalIsLessThan:v1]) {
NSLog(@"v0 < v1 : v0 = %@, v1 = %@", v0, v1);
}
- 示例六：设置 NSDecimalNumberBehaviors
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
// 设置全局 NSDecimalNumberBehaviors
{
[NSString nn_setDecimalNumberGlobalBehavior:[DecimalNumberGlobalBehavior class]];
NSString *v = @"1".nn_div(@(3));
NSLog(@"%@ = %@", v, v.nn_formula);
}
// 当前计算式 NSDecimalNumberBehaviors
{
DecimalNumberBehavior *behavior = [DecimalNumberBehavior new];
NSString *v = @"1".nn_behavior(behavior).nn_div(@(3)).nn_div(@(2));
NSLog(@"%@ = %@", v, v.nn_formula);
}
// 使用 NSDecimalNumberHandler
{
NSDecimalNumberHandler *behavior = [[NSDecimalNumberHandler alloc] initWithRoundingMode:NSRoundPlain
scale:4
raiseOnExactness:false
raiseOnOverflow:false
raiseOnUnderflow:false
raiseOnDivideByZero:false];
NSString *v = @"1".nn_behavior(behavior).nn_div(@(3));
NSLog(@"%@ = %@", v, v.nn_formula);
}
- 示例六：异常计算（异常计算结果统一为字符串：@”NaN”，即
[[NSDecimalNumber notANumber] stringValue]）
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
{
//( 2 × [UIView new] )
NSString *v = @"2".nn_mul([UIView new]);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( 2 / 0 )
NSString *v = @"2".nn_div(@"0");
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( nil / nil )
NSString *v = NN_Trust(nil).nn_div(nil);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( nil / 0 )
NSString *v = NN_Trust(nil).nn_div(@(0));
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( nil / [UIView new] )
NSString *v = NN_Trust(nil).nn_div([UIView new]);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( nil / [NSNull null] )
NSString *v = NN_Trust(nil).nn_div([NSNull null]);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( [NSNull null] / [NSNull null] )
NSString *v = [NSNull null].nn_div([NSNull null]);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( [NSNull null] / 0 )
NSString *v = [NSNull null].nn_div(@(0));
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( [NSNull null] / [UIView new] )
NSString *v = [NSNull null].nn_div([UIView new]);
NSLog(@"%@ = %@", v, v.nn_formula);
}
{
//( [NSNull null] / nil )
NSString *v = [NSNull null].nn_div(nil);
NSLog(@"%@ = %@", v, v.nn_formula);
}
- 示例七：计算式输出
1
2
3
//( ( ( ( 3 - 2 + 5 ) × 3 ) × ( 10 × 2 ) ) ÷ 2 )
NSString *v = @(3).nn_sub(@(2)).nn_add(@(5)).nn_mul(@(3)).nn_mul(@(10).nn_mul(@(2))).nn_div(@(2));
NSLog(@"%@", v.nn_formula); //打印值：( ( ( ( 3 - 2 + 5 ) × 3 ) × ( 10 × 2 ) ) ÷ 2 )
安装
CocoaPods
安装最新版的 CocoaPods：
1
$ gem install cocoapods
在 podfile 中添加：
1
pod 'NNDecimalNumber', '~> 2.0.0'
然后在终端执行：
1
$ pod install
如安装失败，提示：
1
[!] Unable to find a specification for `NNDecimalNumber`
尝试使用命令：
1
pod install --repo-update
其他
Inspiration RLArithmetic
