去除红色字体

NSString *name;

NSString *name;

- (void)applicationDidEnterBackground:(UIApplication *)application {
    
    typedef NS_ENUM(NSInteger, UIButtonType) {
        UIButtonTypeDetailDisclosure,
        UIButtonTypeInfoLight,
        UIButtonTypeInfoDark,
        UIButtonTypeContactAdd,
    };
    
    struct CLLocationCoordinate2D {
        CLLocationDegrees latitude;
        CLLocationDegrees longitude;
    };
    
    textView.textViewShouldBeginEditing = ^(UITextView *textView){
        
        return YES;
    };
}

if (1 == 1) {//判断是否为真
    //代码
}//判断是否为真

for (i=1; i++; i<=7)

for (i=1; i++; i<=NUM_DAYS_IN_WEEK)

CGRect frame   = self.view.frame;
CGFloat x 	   = CGRectGetMinX(frame);
CGFloat y 	   = CGRectGetMinY(frame);
CGFloat width  = CGRectGetWidth(frame);
CGFloat height = CGRectGetHeight(frame);
CGRect frame   = CGRectMake(0.0, 0.0, width, height);

- (instancetype)init
{
    self = [super init];
    if (self) {
        //代码
    }
    return self;
}

+ (instancetype)sharedInstance
{
    static id instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[self alloc] init];
    });
    return instance;
}

//普通常量
static const NSTimeInterval ANIMATION_DURATION = 0.3;

//外部常量
extern const NSTimeInterval TYANIMATION_DURATION;