我记录的一点代码片段。。。

第一次写文章，先简单分享一点代码开始，不对之处，还望指正。。。

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1.获取app版本号，常用来做版本更新。

NSString *version = [[[NSBundle mainBundle]infoDictionary]objectForKey:@"CFBundleShortVersionString"];

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2.在应用内打开设置，获取各种权限。

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=应用的bundle ID"]];

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3.iOS8之后修改系统弹出提示窗的字体颜色

UIAlertAction *action = [UIAlertAction actionWithTitle:title style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { 
 }]; 
[action setValue:[UIColor redColor] forKey:@"_titleTextColor"];

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4.获取相机，麦克风，推送通知的权限状态

//摄像头权限
AVAuthorizationStatus  status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
//麦克风权限
AVAuthorizationStatus  status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
//推送通知权限
UIUserNotificationType type = [[UIApplication sharedApplication] currentUserNotificationSettings].types 

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5.在视图上面添加渐变色

- (CAGradientLayer *)shadowAsInverseWithFrame:(CGRect) frame;
{
    CAGradientLayer *newShadow = [[CAGradientLayer alloc] init];
    CGRect newShadowFrame = CGRectMake(0, 0, frame.size.width, frame.size.height);
    newShadow.frame = newShadowFrame;
    //添加渐变的颜色组合
    newShadow.colors = [NSArray arrayWithObjects:(id)[UIColor redColor].CGColor,(id)[UIColor blackColor].CGColor,nil];
    return newShadow;
}

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今天先写到这里，还有一些尚需整理，欢迎大家纠正！