NSArray 数组排序

结果是升序排列

//方式二：使用块完成排
NSArray *array = [NSArray arrayWithObjects:@"1bc",@"4b6",@"123",@"789",@"3ef", nil];
NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
//这里的代码可以参照上面compare:默认的排序方法，也可以把自定义的方法写在这里，给对象排序
NSComparisonResult result = [obj1 compare:obj2];
return result;
}];
NSLog(@"排序后:%@",sortedArray);

方法3:自定义排序

#import "Person.h"
@implementation Person
@synthesize name,age;
-(id)initWithNameAndAge:(NSString*) aName and:(int) aAge{
if (self=[super init]) {
name=aName;
age=aAge;
}
return self;
}
//自定义排序方法
-(NSComparisonResult)comparePersonByAge:(Person *)person{
//默认按年龄排序
NSComparisonResult result = [[NSNumber numberWithInt:person.age] compare:[NSNumber numberWithInt:self.age]];//注意:基本数据类型要进行数据转换
//如果年龄一样，就按照名字排序
//if (result == NSOrderedSame) {
// result = [self.name compare:person.name];
//}
return result;
}
-(NSComparisonResult)comparePersonByName:(Person *)person{
//默认按年龄排序
NSComparisonResult result = [ person.name compare:self.name];//注意:基本数据类型要进行数据转换
//如果年龄一样，就按照名字排序
if (result == NSOrderedSame) {
result = [[NSNumber numberWithInt:person.age] compare:[NSNumber numberWithInt:self.age]];
}
return result;
}
- (NSString *)description
{
return [NSString stringWithFormat:@"%@ %d", name,age];
}
@end

#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
Person *p1 = [[Person alloc]initWithNameAndAge:@" qweasadsasd" and:25];
Person *p2 = [[Person alloc]initWithNameAndAge:@" 1234" and:28];
Person *p3 = [[Person alloc]initWithNameAndAge:@"123" and:2];
Person *p4 = [[Person alloc]initWithNameAndAge:@"zxc" and:89];
Person *p5 = [[Person alloc]initWithNameAndAge:@"123" and:8];
NSArray * persons = [NSArray arrayWithObjects:p1,p2,p3,p4,p5,nil];
NSArray *sortedArray = [persons sortedArrayUsingSelector:@selector(comparePersonByName:)];
NSLog(@"排序后:%@",sortedArray);
}
return 0;
}

方法四：高级排序