objective-c - Xcode 4.2 with Storyboard：程序接收信号：“EXC_BAD_ACCESS”

Answer 1

One possibility is to use an property

in .h

@property (copy, nonatomic) NSArray *locations;

in .m

@synthesize locations;
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.locations = [NSArray arrayWithObjects:@"New Delhi", @"Durban", @"Islamabad", @"Johannesburg", @"Kathmandu", @"Dhaka", @"Paris", @"Rome", @"Colorado Springs", @"Rio de Janeiro", @"Beijing", @"Canberra", @"Malaga", @"Ottawa", @"Santiago de Chile", nil];

}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.locations count];
}

Answer 2

First:

locations = [NSArray arrayWithObjects:@"New Delhi", @"Durban", @"Islamabad", @"Johannesburg", @"Kathmandu", @"Dhaka", @"Paris", @"Rome", @"Colorado Springs", @"Rio de Janeiro", @"Beijing", @"Canberra", @"Malaga", @"Ottawa", @"Santiago de Chile", nil];

[NSArray arrayWithObjects...] returns an autoreleased object and as you're setting it directly to your instance variable, you need to retain it:

locations = [[NSArray arrayWithObjects:@"New Delhi", @"Durban", @"Islamabad", @"Johannesburg", @"Kathmandu", @"Dhaka", @"Paris", @"Rome", @"Colorado Springs", @"Rio de Janeiro", @"Beijing", @"Canberra", @"Malaga", @"Ottawa", @"Santiago de Chile", nil] retain];

Note:It's a good practice to use properties instead of instance variables.

Second:

cell = [[UITableViewCell alloc] initWithStyle:
                UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

According to the memory management rules alloc init returns a retained object, so you'll leak here. Change it to:

cell = [[[UITableViewCell alloc] initWithStyle:
                UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];