- 支持的类型
equalTo支持的是id类型，不能直接写数据，需用@
mas_equalTo 支持类型转换，是对equalTo 的封装，支持CGSize CGPoint NSNumber UIEdgeinsets等
- 看源码
mas_equalTo是一个对equalTo的宏
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#define mas_equalTo(...) equalTo(MASBoxValue((__VA_ARGS__)))
给定标量或结构值，将其包装在 NSValue 中
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#define MASBoxValue(value) _MASBoxValue(@encode(__typeof__((value))), (value))
static inline id _MASBoxValue(const char *type, ...) {
va_list v;
va_start(v, type);
id obj = nil;
if (strcmp(type, @encode(id)) == 0) {
id actual = va_arg(v, id);
obj = actual;
} else if (strcmp(type, @encode(CGPoint)) == 0) {
CGPoint actual = (CGPoint)va_arg(v, CGPoint);
obj = [NSValue value:&actual withObjCType:type];
} else if (strcmp(type, @encode(CGSize)) == 0) {
CGSize actual = (CGSize)va_arg(v, CGSize);
obj = [NSValue value:&actual withObjCType:type];
} else if (strcmp(type, @encode(MASEdgeInsets)) == 0) {
MASEdgeInsets actual = (MASEdgeInsets)va_arg(v, MASEdgeInsets);
obj = [NSValue value:&actual withObjCType:type];
} else if (strcmp(type, @encode(double)) == 0) {
double actual = (double)va_arg(v, double);
obj = [NSNumber numberWithDouble:actual];
} else if (strcmp(type, @encode(float)) == 0) {
float actual = (float)va_arg(v, double);
obj = [NSNumber numberWithFloat:actual];
} else if (strcmp(type, @encode(int)) == 0) {
int actual = (int)va_arg(v, int);
obj = [NSNumber numberWithInt:actual];
} else if (strcmp(type, @encode(long)) == 0) {
long actual = (long)va_arg(v, long);
obj = [NSNumber numberWithLong:actual];
} else if (strcmp(type, @encode(long long)) == 0) {
long long actual = (long long)va_arg(v, long long);
obj = [NSNumber numberWithLongLong:actual];
} else if (strcmp(type, @encode(short)) == 0) {
short actual = (short)va_arg(v, int);
obj = [NSNumber numberWithShort:actual];
} else if (strcmp(type, @encode(char)) == 0) {
char actual = (char)va_arg(v, int);
obj = [NSNumber numberWithChar:actual];
} else if (strcmp(type, @encode(bool)) == 0) {
bool actual = (bool)va_arg(v, int);
obj = [NSNumber numberWithBool:actual];
} else if (strcmp(type, @encode(unsigned char)) == 0) {
unsigned char actual = (unsigned char)va_arg(v, unsigned int);
obj = [NSNumber numberWithUnsignedChar:actual];
} else if (strcmp(type, @encode(unsigned int)) == 0) {
unsigned int actual = (unsigned int)va_arg(v, unsigned int);
obj = [NSNumber numberWithUnsignedInt:actual];
} else if (strcmp(type, @encode(unsigned long)) == 0) {
unsigned long actual = (unsigned long)va_arg(v, unsigned long);
obj = [NSNumber numberWithUnsignedLong:actual];
} else if (strcmp(type, @encode(unsigned long long)) == 0) {
unsigned long long actual = (unsigned long long)va_arg(v, unsigned long long);
obj = [NSNumber numberWithUnsignedLongLong:actual];
} else if (strcmp(type, @encode(unsigned short)) == 0) {
unsigned short actual = (unsigned short)va_arg(v, unsigned int);
obj = [NSNumber numberWithUnsignedShort:actual];
}
va_end(v);
return obj;
}
mas_equalTo比较的是值，而equalTo比较的是View以下实现的是相同的效果1 2
make.bottom.mas_equalTo(ws.view.mas_bottom); make.bottom.equalTo(ws.view);
- 如果要去掉
mas_前缀，只用equalTo，操作如下，添加到.prefix文件
但是一般开发下不建议团队这样修正
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// 添加这个宏，就不用带mas_前缀
#define MAS_SHORTHAND
// 添加这个宏，equalTo就等价于mas_equalTo
#define MAS_SHORTHAND_GLOBALS
// 这个头文件一定要放在上面两个宏的后面
#import "Masonry.h"
- 最后
Masonryblock 里需要写weakself吗?
mas_makeConstraints 的block 是局部变量，在花括号之外就释放了, 所以retain- cycle 产生不了
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- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *))block {
self.translatesAutoresizingMaskIntoConstraints = NO;
MASConstraintMaker *constraintMaker = [[MASConstraintMaker alloc] initWithView:self];
block(constraintMaker);
return [constraintMaker install];
}
