NSMutableString 总是“超出范围”？

Question

在我的 .h 文件中，我有：

    #import <UIKit/UIKit.h>


@interface untitled : UIViewController 
{
    NSMutableString * sResults;
}

@property (nonatomic,retain) NSMutableString * sResults;

@end

在我的 .mi 有：

#import "untitled.h"


@implementation untitled

@synthesize sResults;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    sResults = [[NSMutableString alloc] initWithString:@"Hello"];
    [sResults appendString:@" World"];
}

@end

每当我检查 sResults 时，它都会说“超出范围”..我做错了什么？

Answer 1

试试这个：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.sResults = [NSMutableString stringWithString:@"Hello"]; //retained in synthesized setter
    [self.sResults appendString:@" World"];
}