患者:两个控制器--ViewController和(模态呈现)RecorderViewController 症状:在RecorderViewController以模态方式呈现之后,它可以完成一些工作。被解雇后,程序崩溃了EXC_BAD_ACCESS
在AppDelegate.m中:
@synthesize window = _window;
@synthesize controller = _controller;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
// Override point for customization after application launch.
self.controller = [ViewController alloc];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = self.controller;
[self.window makeKeyAndVisible];
return YES;
}
在ViewController.m中
#import "ViewController.h"
#import "RecorderViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize presentModalButton;
- (void)loadView
{
self.view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
self.presentModalButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.presentModalButton.frame = CGRectMake(0, self.view.frame.size.height/2, 100, 50);
[self.presentModalButton addTarget:self action:@selector(goToRecorderButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.presentModalButton];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)goToRecorderButtonPressed:(id)sender {
RecorderViewController *recorderVC = [RecorderViewController alloc];
[self presentModalViewController:recorderVC animated:YES];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
self.presentModalButton = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
在返回UIApplicationMain时在main.m中崩溃: #import
#import "AppDelegate.h"
int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
答案 0 :(得分:0)
我认为goToRecorderButtonPressed
方法存在问题。
看,您正在为recorderVC
分配内存但不启动它。您应该使用可用方法初始化对象,例如init
:
- (IBAction)goToRecorderButtonPressed:(id)sender {
RecorderViewController *recorderVC = [[RecorderViewController alloc] init];
[self presentModalViewController:recorderVC animated:YES];
}