iOS:NSValue包装CGPoint的NSArray排序
Qeustion:与标题中所述的差不多。我在网上查了一下,但找不到任何容易理解的东西。我有iOS:NSValue包装CGPoint的NSArray排序,ios,sorting,nsarray,cgpoint,nsvalue,Ios,Sorting,Nsarray,Cgpoint,Nsvalue,Qeustion:与标题中所述的差不多。我在网上查了一下,但找不到任何容易理解的东西。我有NSArray,其中包含许多NSValue。那些NSValue都有一个CGPoint。我想按x然后按y秒对它们进行排序 某些代码: NSValue * valuePointObject = [NSValue valueWithCGPoint:CGPointMake(x, y)]; NSArray *array = [[NSArray alloc] initWithObjects: valuePointObj
NSArray
,其中包含许多NSValue
。那些NSValue
都有一个CGPoint
。我想按x
然后按y
秒对它们进行排序
某些代码:
NSValue * valuePointObject = [NSValue valueWithCGPoint:CGPointMake(x, y)];
NSArray *array = [[NSArray alloc] initWithObjects: valuePointObject, valuePointObject2, ..., nil];
要对值进行排序,必须再次将它们“取消装箱”到CGPoints。代码可能类似于:
NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(NSValue *obj1, NSValue *obj2) {
CGPoint p1 = [obj1 CGPointValue];
CGPoint p2 = [obj2 CGPointValue];
if (p1.x == p2.x) return p1.y < p2.y;
return p1.x < p2.x;
}];
NSArray*sortedArray=[使用比较器的数组sortedArray:^NSComparisonResult(NSValue*obj1,NSValue*obj2){
CGPoint p1=[obj1 CGPointValue];
CGPoint p2=[obj2 CGPointValue];
如果(p1.x==p2.x)返回p1.y
array=[array sortedarray usingcomparator:^n比较结果(NSValue*obj1,NSValue*obj2){
if(obj1.CGPointValue.xobj2.CGPointValue.x){
退而求其次;
}
if(obj1.CGPointValue.yobj2.CGPointValue.y){
退而求其次;
}
返回指定名称;
}];
array = [array sortedArrayUsingComparator:^NSComparisonResult(NSValue *obj1, NSValue *obj2) {
if (obj1.CGPointValue.x < obj2.CGPointValue.x) {
return NSOrderedAscending;
}
if (obj1.CGPointValue.x > obj2.CGPointValue.x) {
return NSOrderedDescending;
}
if (obj1.CGPointValue.y < obj2.CGPointValue.y) {
return NSOrderedAscending;
}
if (obj1.CGPointValue.y > obj2.CGPointValue.y) {
return NSOrderedDescending;
}
return NSOrderedSame;
}];