本篇主要介绍的是 在真正转之前的几个辅助函数
/**
Get number from property.
@discussion Caller should hold strong reference to the parameters before this function returns.
@param model Should not be nil.
@param meta Should not be nil, meta.isCNumber should be YES, meta.getter should not be nil.
@return A number object, or nil if failed.
*/
static force_inline NSNumber *ModelCreateNumberFromProperty(__unsafe_unretained id model,
__unsafe_unretained _YYModelPropertyMeta *meta) {
switch (meta->_type & YYEncodingTypeMask) {
case YYEncodingTypeBool: {
return @(((bool (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeInt8: {
return @(((int8_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeUInt8: {
return @(((uint8_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeInt16: {
return @(((int16_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeUInt16: {
return @(((uint16_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeInt32: {
return @(((int32_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeUInt32: {
return @(((uint32_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeInt64: {
return @(((int64_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeUInt64: {
return @(((uint64_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter));
}
case YYEncodingTypeFloat: {
float num = ((float (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter);
if (isnan(num) || isinf(num)) return nil;
return @(num);
}
case YYEncodingTypeDouble: {
double num = ((double (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter);
if (isnan(num) || isinf(num)) return nil;
return @(num);
}
case YYEncodingTypeLongDouble: {
double num = ((long double (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter);
if (isnan(num) || isinf(num)) return nil;
return @(num);
}
default: return nil;
}
}
这个函数的目的 是 把 _YYModelPropertyMeta.isCNumber == YES 的情况转成NSNumber
// 像这样的类型是C 的 需要调用上边的函数进行转换@property (nonatomic, assign) int32_t blockWord;
((int8_t (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter) 这个方法 是 类似[obj method]; 这中方法调用的Runtime 内部实现 根据方法的返回值不同获取不同的返回类型
((Class (*)(id, SEL))(void *) objc_msgSend)((id)model, meta->_getter)
下边这个方法是 把 NSNumber 赋值给 原有c 属性
/**
Set number to property.
@discussion Caller should hold strong reference to the parameters before this function returns.
@param model Should not be nil.
@param num Can be nil.
@param meta Should not be nil, meta.isCNumber should be YES, meta.setter should not be nil.
*/
static force_inline void ModelSetNumberToProperty(__unsafe_unretained id model,
__unsafe_unretained NSNumber *num,
__unsafe_unretained _YYModelPropertyMeta *meta) {
switch (meta->_type & YYEncodingTypeMask) {
case YYEncodingTypeBool: {
((void (*)(id, SEL, bool))(void *) objc_msgSend)((id)model, meta->_setter, num.boolValue);
} break;
case YYEncodingTypeInt8: {
((void (*)(id, SEL, int8_t))(void *) objc_msgSend)((id)model, meta->_setter, (int8_t)num.charValue);
} break;
case YYEncodingTypeUInt8: {
((void (*)(id, SEL, uint8_t))(void *) objc_msgSend)((id)model, meta->_setter, (uint8_t)num.unsignedCharValue);
} break;
case YYEncodingTypeInt16: {
((void (*)(id, SEL, int16_t))(void *) objc_msgSend)((id)model, meta->_setter, (int16_t)num.shortValue);
} break;
case YYEncodingTypeUInt16: {
((void (*)(id, SEL, uint16_t))(void *) objc_msgSend)((id)model, meta->_setter, (uint16_t)num.unsignedShortValue);
} break;
case YYEncodingTypeInt32: {
((void (*)(id, SEL, int32_t))(void *) objc_msgSend)((id)model, meta->_setter, (int32_t)num.intValue);
}
case YYEncodingTypeUInt32: {
((void (*)(id, SEL, uint32_t))(void *) objc_msgSend)((id)model, meta->_setter, (uint32_t)num.unsignedIntValue);
} break;
case YYEncodingTypeInt64: {
if ([num isKindOfClass:[NSDecimalNumber class]]) {
((void (*)(id, SEL, int64_t))(void *) objc_msgSend)((id)model, meta->_setter, (int64_t)num.stringValue.longLongValue);
} else {
((void (*)(id, SEL, uint64_t))(void *) objc_msgSend)((id)model, meta->_setter, (uint64_t)num.longLongValue);
}
} break;
case YYEncodingTypeUInt64: {
if ([num isKindOfClass:[NSDecimalNumber class]]) {
((void (*)(id, SEL, int64_t))(void *) objc_msgSend)((id)model, meta->_setter, (int64_t)num.stringValue.longLongValue);
} else {
((void (*)(id, SEL, uint64_t))(void *) objc_msgSend)((id)model, meta->_setter, (uint64_t)num.unsignedLongLongValue);
}
} break;
case YYEncodingTypeFloat: {
float f = num.floatValue;
if (isnan(f) || isinf(f)) f = 0;
((void (*)(id, SEL, float))(void *) objc_msgSend)((id)model, meta->_setter, f);
} break;
case YYEncodingTypeDouble: {
double d = num.doubleValue;
if (isnan(d) || isinf(d)) d = 0;
((void (*)(id, SEL, double))(void *) objc_msgSend)((id)model, meta->_setter, d);
} break;
case YYEncodingTypeLongDouble: {
long double d = num.doubleValue;
if (isnan(d) || isinf(d)) d = 0;
((void (*)(id, SEL, long double))(void *) objc_msgSend)((id)model, meta->_setter, (long double)d);
} // break; commented for code coverage in next line
default: break;
}
}
// 这个相对于上边的那个Runtime 方法 多了一个参数 ((void (*)(id, SEL, bool))(void *) objc_msgSend)((id)model, meta->_setter, num.boolValue);
((void (*)(id, SEL, 参数))(void *) objc_msgSend)((id)model, meta->_setter, 参数值);
下边的这个方法是核心方法， 把值 赋值给model 需要的参数 有3 个
1. 需要被复制的Model
2. 值
3. 需要把值赋值给谁
数据类型主要分三种情况，根据 _PropertyMeta对象记录的类型
- propertyMeta->
_isCNumber，基本数值类型- bool
- int8/uint8
- int16/uint16
- int32/uint32
- int64/uint64
- float
- double
- long double
- propertyMeta->
_foundationType，Foundation Class- NSString
- NSArray
- NSSet
- NSDictionary
- NSNumber
- NSDecimalNumber
- NSValue
- NSData
- NSDate
- NSURL
- propertyMeta->
_encodingType & XZHEncodingTypeIvarMask，属性变量类型其他类型- 自定义NSObject实体类
- Class
- SEL
- Block
- Struct/Union
- c数组
- c字符串
- c指针
时间： 2024-10-13 23:40:56