NSArray NSMutableArray


注: iOS 6 新的快捷初始化写法:

NSArray:
 
 
 
    
 
1. NSArray *array = @[@"xiaoyu",@"yushuyi"];  
 
 
 NSMutableArray:
 
 
 
    
 
1. NSMutableArray *MArray = [@[@"xiaoyu",@"yushuyi"] mutableCopy];  
 

1:使用Block遍历数据 

 
    
   
 
 
1. NSArray *array = @[@"11",@"22"];  
2. [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {  
3. "%@ %d",obj,idx);  
4. }];

注:为stop赋值为YES 可停止遍历.

2:带参数设定的Block遍历数据


1. [mArray enumerateObjectsWithOptions:  usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {  
2. "%@",obj);  
3. }];  
 
 
 1:NSEnumerationConcurrent 以并发的方式遍历NSArray
 2:NSEnumerationReverse     以逆向反向的方式遍历NSArray


3:Array 排序


1. NSArray *sortedArray = [dayDataMArrray sortedArrayUsingComparator: ^(id obj1, id obj2)  
2. {  
3. "yyyy-MM-dd"];  
4. "yyyy-MM-dd"];  
5. if ([obj2Date timeIntervalSinceDate:obj1Date] > 0) {  
6. return (NSComparisonResult)NSOrderedAscending;  
7.     }  
8. if ([obj2Date timeIntervalSinceDate:obj1Date] < 0) {  
9. return (NSComparisonResult)NSOrderedDescending;  
10.     }  
11. return (NSComparisonResult)NSOrderedSame;  
12. }];


注:

排序的理由是由开发者自行定义的.

灵活的返回 NSComparisonResult 即可达到任何排序效果.

4:让数组内的元素依次调用同一个方法


    1. [[self.view subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)];



    也可以传参数: 



      1. - (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument;