[__NSCFDictionary setObject:forKey:]:发送给不可变对象的变异方法 [英] [__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object
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问题描述
-(id)init{
if (self==[super init]) {
NSMutableArray *listname = [[NSMutableArray alloc]initWithObjects:@"cu",@"al",@"zn",@"au",@"ru",@"fu",@"rb",@"pb",@"wr", nil];
NSMutableArray *listVolumn = [NSMutableArray arrayWithCapacity:[listname count]];
for (int i=0; i<[listname count]; i++) {
[listVolumn addObject:[NSNumber numberWithLong:0]];
}
nsmutabledictionary = [[NSDictionary alloc] initWithObjects:listVolumn forKeys:listname];
}
return self;
}
在我的init方法中,我定义了两个NSMutableArray,并将其添加到NSMutableDictionary nsmutabledictionary.在我的另一种方法中:
in my init method,I defined two NSMutableArray,and added to NSMutableDictionary nsmutabledictionary. in my other method:
[nsmutabledictionary setObject:[NSNumber numberWithLong:100] forKey:@"cu"];
但是它在上面的行崩溃:
but it crash at above line:
推荐答案
nsmutabledictionary = [[NSDictionary alloc] initWithObjects:listVolumn forKeys:listname];
应该是
nsmutabledictionary = [[NSMutableDictionary alloc] initWithObjects:listVolumn forKeys:listname];
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