Swizzle Color Transparent

UINavigationBar+DarkTint.h

//
//  UINavigationBar+DarkTint.h
//
//  Created by Justin McNally on 10/15/13.
//
//

#import <UIKit/UIKit.h>

@interface UINavigationBar (DarkTint)
@property CALayer *colorLayer;
@end

UINavigationBar+DarkTint.m

//
//  UINavigationBar+DarkTint.m
//
//  Created by Justin McNally on 10/15/13.
//
//

#import "UINavigationBar+DarkTint.h"
#import <objc/runtime.h>


@implementation UINavigationBar (DarkTint)
@dynamic colorLayer;
static CGFloat const kSpaceToCoverStatusBars = 20.0f;





- (void)swizlayoutSubviews {
  [self swizlayoutSubviews];


  if (self.colorLayer == nil) {
    self.colorLayer = [[CALayer alloc] init];
    self.colorLayer.opacity = .85;
    [self.layer addSublayer:self.colorLayer];
    
    self.colorLayer.backgroundColor = [[UIColor colorWithRed:.26 green:.50 blue:.76 alpha:1] CGColor];
  }
  NSLog(@"%@", self.colorLayer);
  if (self.colorLayer != nil) {
    self.colorLayer.frame = CGRectMake(0, 0 - kSpaceToCoverStatusBars, CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds) + kSpaceToCoverStatusBars);
    
    [self.layer insertSublayer:self.colorLayer atIndex:1];
    NSLog(@"Color Layer = %@", self.colorLayer);
  }
}

-(void) setColorLayer:(CALayer *)colorLayer {
 objc_setAssociatedObject(self, @"colorLayer", colorLayer, OBJC_ASSOCIATION_RETAIN);
}

-(CALayer *) colorLayer {
  return objc_getAssociatedObject(self, @"colorLayer");
}

+(void) load {
  Method original, swizzled;
  original = class_getInstanceMethod(self, @selector(layoutSubviews));
  swizzled = class_getInstanceMethod(self, @selector(swizlayoutSubviews));
  method_exchangeImplementations(original, swizzled);
}

@end