NSString 和 NSArray相互转化用componentsJoinedByString和componentsSeparatedByString

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NSString 和 NSArray相互转化用componentsJoinedByString和componentsSeparatedByString

[摘要：将array数组转换为string字符串 NSString *tempString = [mutableArray componentsJoinedByString:@,]; 将string字符串转换为array数组 NSArray *array = [str componentsSeparatedByString:@,]; // 意义是经过“,”去切割字符串] 

将array数组转换为string字符串

NSString *tempString = [mutableArray componentsJoinedByString:@","];
将string字符串转换为array数组
// 意思是通过“,”来切割字符串
 
将字符串切割成数组
 
 
void)viewDidLoad
 {
 
 
 
NSString *a = [[NSString alloc] initWithString : @"冬瓜，西瓜，火龙果，大头，小狗"
   NSArray *b = [a componentsSeparatedByString:@"，"];
    NSString *a3 = [b objectAtIndex:2];
    NSLog(@"n  b的第三个东东是： %@", a3);
 }