[__NSCFDictionary setObject:forKey:]:发送到不可变对象的变异方法
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中。在我的另一种方法 :[__NSCFDictionary setObject:forKey:]:发送到不可变对象的变异方法
[nsmutabledictionary setObject:[NSNumber numberWithLong:100] forKey:@"cu"];
但它坠毁在上述行:
答
nsmutabledictionary = [[NSDictionary alloc] initWithObjects:listVolumn forKeys:listname];
应该
nsmutabledictionary = [[NSMutableDictionary alloc] initWithObjects:listVolumn forKeys:listname];
答
在你的代码中,我看到nsmutabledictionary = [[NSDictionary alloc] initWithObjects:listVolumn forKeys:listname];
那行,你声明它是NSDictionary而你的意图是NSMutableDictionary
+0
非常感谢你,你是对的。 – Gaojian922188
谢谢你,你是对的 – Gaojian922188