@autoreleasepool EXC_BAD_ACCESS

Question

我有一个简单的UIViewControler,当我调用方法[self performSelectorInBackground:@selector(load)withObject:nil]; 它导致和EXC_BAD_ACCESS

这是UIViewControler.m和UIViewControler.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController

@property (strong, nonatomic) UITextView *myTextView;

@end



#import "ViewController.h"

@implementation ViewController

@synthesize myTextView;

- (id)init {
    self = [super init];
    if (self) {
        myTextView = [[UITextView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        [[self view] addSubview:myTextView];
        [self performSelectorInBackground:@selector(load) withObject:nil];
    }
    return self;
}

- (void) load {
    @autoreleasepool {
        [myTextView setText:@"LOADING ..."];
        //DO SOMETHING ....
    }
}

@end

PS:

该项目使用Objective-C ARC

Answer 1

UIKit对象不是线程安全的:您只能在主线程上访问它们.该行[myTextView setText:@"LOADING ..."];无法在后台线程中安全执行.

这可能是也可能不是你得到EXC_BAD_ACCESS错误的原因但没有看到load方法的其余部分我无法知道还有什么可能是错的.