在Objective-C中将字符串转换为float

Question

如何在Objective-C中将字符串转换为浮点数？

我试图将我从JSON回来的几个字符串相乘:

float subTotal = [[[[purchaseOrderItemsJSON objectAtIndex:i] objectAtIndex:j] objectForKey:@"Price"] floatValue];

NSLog(@"%@",subTotal);

这给了我:(null)在控制台中.我知道有一个有效的字符串来自该数组,因为我已经使用它来在标签中显示它的值.

Answer 1

your_float = [your_string floatValue];

编辑:

试试这个:

  NSLog(@"float value is: %f", your_float);

Answer 2

这样做的正确方法是

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;

float value = [numberFormatter numberFromString:@"32.12"].floatValue;