iOS presentViewController方式弹出的vc背景色半透明时会变黑

前言：开发中遇到弹出一个半透明的controller的情况，用presentViewController方式弹出时背景色是黑的
解决方法：
1.在弹出时设置弹出模式

FaHuoVC *vc = [[FaHuoVC alloc] initNoChecking];
 //全屏幕覆盖
vc.modalPresentationStyle = UIModalPresentationOverCurrentContext|UIModalPresentationFullScreen;
//设置弹出动画：淡入淡出
 vc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;     
 [self presentViewController:vc animated:YES completion:nil];

2.在半透明控制器中重写init方法

- (instancetype)init {
    self = [super init];
    if (self) {
        self.modalPresentationStyle = UIModalPresentationOverFullScreen;
        self.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        self.view.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
        [self.bgView cornerRadius:6];
    }
    return self;
}

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