Ios NSNumberFormatter设置格式错误

正在开发我的第一个iOS应用程序。我认为这段代码应该可以工作，但我得到以下错误。也许我错过了什么重要的东西

对于'NSNumberFormatter'没有可见的@interface声明选择器'setFormat'

NSNumberFormatter* formatter = [[NSNumberFormatter alloc] init];
[formatter setFormat:@"#0.00"];

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您无法设置此处提供的格式。设置数字格式，如下所示

[formatter setNumberStyle:NSNumberFormatterSpellOutStyle];
//or other styles like NSNumberFormatterDecimalStyle,NSNumberFormatterPercentStyle

或者，您可以创建自定义数字格式，如下所示：

[formatter setPositiveFormat:@"#0.00"];

这里给出了一个很好的教程

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对于NSNumberFormatter，您不能调用setFormat:for

一些示例代码：

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;
NSString *string = [formatter stringFromNumber:[NSNumber numberWithInt:123456789]];
NSLog(@"Formatted number string:%@",string);

numberStyle枚举：

enum {  
    NSNumberFormatterNoStyle = kCFNumberFormatterNoStyle,
    NSNumberFormatterDecimalStyle = kCFNumberFormatterDecimalStyle,
    NSNumberFormatterCurrencyStyle = kCFNumberFormatterCurrencyStyle,
    NSNumberFormatterPercentStyle = kCFNumberFormatterPercentStyle,
    NSNumberFormatterScientificStyle = kCFNumberFormatterScientificStyle,
    NSNumberFormatterSpellOutStyle = kCFNumberFormatterSpellOutStyle
};

每个数字类型的重新查找：

[1243:403] Formatted number string:123456789
[1243:403] Formatted number string:123,456,789
[1243:403] Formatted number string:￥123,456,789.00
[1243:403] Formatted number string:-539,222,988%
[1243:403] Formatted number string:1.23456789E8
[1243:403] Formatted number string:one hundred twenty-three million four hundred fifty-six thousand seven hundred eighty-nine

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使用[formatter setPositiveFormat:@“00.00E+00”]；setFormat在iOS上不可用。这个问题应该有帮助：[iPhone NSNumberFormatter setFormat][1]。[1]: