NSNumber from CGFloat

Question

Is there a safe way to "convert" a CGFloat to a NSNumber ?

NSNumber has the numberWithFloat: and numberWithDouble: methods but CGFloat being defined as float or double depending on the platform, it seems risky to use either one of them.

或者numberWithDouble:安全使用a CGFloat,因为它是更精确的？

Answer 1

我相信@ NSNumber文字是足够好的

@(myCGFloat)

在这里阅读更多内容:http://clang.llvm.org/docs/ObjectiveCLiterals.html

Answer 2

这是我处理它的方式:

@interface NSNumber (CGFloatAdditions)

+ (NSNumber*)numberWithCGFloat: (CGFloat)value;
- (CGFloat)CGFloatValue;

@end

@implementation NSNumber (CGFloatAdditions)

+ (NSNumber*)numberWithCGFloat: (CGFloat)value
{
#if CGFLOAT_IS_DOUBLE
    return [NSNumber numberWithDouble: (double)value];
#else
    return [NSNumber numberWithFloat: value];
#endif
}

- (CGFloat)CGFloatValue
{
#if CGFLOAT_IS_DOUBLE
    return [self doubleValue];
#else
    return [self floatValue];
#endif
}


@end

CGFLOAT_IS_DOUBLECGBase.h由平台有条件地定义.