UImage视图动画在我的iPhone上不起作用

构建代码后，我的手机上没有任何动画

但是代码看起来不错，我不知道如何解决，

我的图像是829 * 445，这会导致此问题吗？

有人可以帮我解决这个问题，我将非常感激，谢谢

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSArray *animationImages = [NSArray arrayWithObjects:[UIImage imageNamed:@"1.jpg"],
                                [UIImage imageNamed:@"2.jpg"],
                                [UIImage imageNamed:@"3.jpg"],
                                [UIImage imageNamed:@"4.jpg"],nil];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,150,150)];
    imageView.animationImages = animationImages ;
    imageView.animationRepeatCount = 2;
    imageView.animationDuration= 4.0;
    [imageView startAnimating];

    [NSTimer scheduledTimerWithTimeInterval:4.0 target:self
                                   selector:@selector(animationDone:)
                                   userInfo:nil repeats:NO];
} 

-(void)animationDone:(NSTimer*)inTimer
{
    [inTimer invalidate];
    inTimer = nil;
    NSLog(@"animationDone ");

}

@end