如何更改iOS 7中未選定標籤欄項目的顏色？

Question

我試圖改變標籤欄中的未選圖像的顏色，默認情況下它們變成灰色，即使圖像是另一種顏色。

我已經在搜索此內容，但答案僅適用於iOS 6或更低版本。

Answer 1

最近這讓我很生氣，所以我寫了自己的類來處理它，它適用於我嘗試過的每個iOS版本;）它很容易擴展以做你想做的任何事情！

GozTabBar.h：

#import <UIKit/UIKit.h> 
#import "GozTabBarItem.h" 

@protocol GozTabBarDelegate; 

@interface GozTabBar : UIView 
{ 
    UITapGestureRecognizer* pTapGestureRecognizer; 

} 

@property         UIColor*     backgroundColour; 
@property (unsafe_unretained, nonatomic) id <GozTabBarDelegate> delegate; 
@end 

@protocol GozTabBarDelegate <NSObject> 

- (int)    getNumberOfTabBarItemsForTabBar: (GozTabBar*) pTabBar; 
- (GozTabBarItem*) getTabBarItemsAtIndex: (int) index ForTabBar: (GozTabBar*) pTabBar; 
- (void)   selectedItemAtIndex: (int) index ForTabBar: (GozTabBar*) pTabBar; 
- (int)    getSelectedItemIndexForTabBar: (GozTabBar*) pTabBar; 
@end 

GozTabBar.m

#import "GozTabBar.h" 
#import "GozTabBarItem.h" 

@implementation GozTabBar 

@synthesize backgroundColour; 
@synthesize delegate; 

const int leftEdgeInset   = 8; 
const int rightEdgeInset  = 8; 

const int topEdgeInset   = 8; 
const int bottomEdgeInset  = 8; 

- (id)init 
{ 
    self = [super init]; 
    if (self) 
    { 
     pTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(onTap:)]; 
     [self addGestureRecognizer: pTapGestureRecognizer]; 
    } 
    return self; 
} 

- (id) initWithCoder:(NSCoder *)aDecoder 
{ 
    self = [super initWithCoder:aDecoder]; 
    if (self) 
    { 
     pTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(onTap:)]; 
     [self addGestureRecognizer: pTapGestureRecognizer]; 
    } 
    return self; 
} 

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) 
    { 
     pTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(onTap:)]; 
     [self addGestureRecognizer: pTapGestureRecognizer]; 
    } 
    return self; 
} 

// Recognise a tap on the item (If it is on an item). 
- (void)onTap: (UIGestureRecognizer *)gestureRecognizer 
{ 
    const int leftRightEdgeInset = leftEdgeInset + rightEdgeInset; 
    const int topBottomEdgeInset = topEdgeInset + bottomEdgeInset; 

    int numItems  = 0; 
    if ([self.delegate respondsToSelector: @selector(getNumberOfTabBarItemsForTabBar:)]) 
    { 
     numItems = [self.delegate getNumberOfTabBarItemsForTabBar: self]; 
    } 
    if (numItems > 0) 
    { 
     int widthLessInset = (self.frame.size.width - leftRightEdgeInset); 
     int itemWidth  = widthLessInset/numItems; 

     int heightLessInset = self.frame.size.height - topBottomEdgeInset; 
     int itemHeight  = heightLessInset; 

     CGPoint tapPoint = [gestureRecognizer locationInView: self]; 

     // Draw the custom items. 
     for(int i = 0; i < numItems; i++) 
     { 
      CGRect tabBarItemRect = CGRectMake(leftEdgeInset + (itemWidth * i), 0, itemWidth, itemHeight); 
      if (CGRectContainsPoint(tabBarItemRect, tapPoint)) 
      { 
       if ([self.delegate respondsToSelector: @selector(selectedItemAtIndex:ForTabBar:)]) 
       { 
        [self.delegate selectedItemAtIndex: i ForTabBar: self]; 
       } 
       break; 
      } 
     } 
    } 
} 


- (void)drawRect:(CGRect)rect 
{ 
    const int leftRightEdgeInset = leftEdgeInset + rightEdgeInset; 
    const int topBottomEdgeInset = topEdgeInset + bottomEdgeInset; 

    CGContextRef ctx = UIGraphicsGetCurrentContext(); 

    // Fill the background in the relevant colour. 
    CGContextSetFillColorWithColor(ctx, backgroundColour.CGColor); 
    CGContextFillRect(ctx, rect); 

    int numItems  = 0; 
    if ([self.delegate respondsToSelector: @selector(getNumberOfTabBarItemsForTabBar:)]) 
    { 
     numItems = [self.delegate getNumberOfTabBarItemsForTabBar: self]; 
    } 
    if (numItems > 0) 
    { 
     int widthLessInset = (rect.size.width - leftRightEdgeInset); 
     int itemWidth  = widthLessInset/numItems; 

     int heightLessInset = rect.size.height - topBottomEdgeInset; 
     int itemHeight  = heightLessInset; 

     int selectedIndex = 0; 
     if ([self.delegate respondsToSelector: @selector(getSelectedItemIndexForTabBar:)]) 
     { 
      selectedIndex = [self.delegate getSelectedItemIndexForTabBar: self]; 
     } 


     // Draw the custom items. 
     for(int i = 0; i < numItems; i++) 
     { 
      //GozTabBarItem* pItem = [self.items objectAtIndex: i]; 
      GozTabBarItem* pItem = nil; 
      if ([self.delegate respondsToSelector: @selector(getTabBarItemsAtIndex:ForTabBar:)]) 
      { 
       pItem = [self.delegate getTabBarItemsAtIndex: i ForTabBar: self]; 
      } 
      if (pItem != nil) 
      { 
       CGRect tabBarItemRect  = CGRectMake(leftEdgeInset + (itemWidth * i), topEdgeInset, itemWidth, itemHeight); 
       CGPoint tabBarItemCenter = CGPointMake(tabBarItemRect.origin.x + (tabBarItemRect.size.width/2), tabBarItemRect.origin.y + (tabBarItemRect.size.height/2)); 

       UIImage* pDrawImage = nil; 
       if (i == selectedIndex) 
       { 
        pDrawImage = pItem.selectedImage; 
       } 
       else 
       { 
        pDrawImage = pItem.unSelectedImage; 
       } 

       CGRect drawRect = CGRectMake(tabBarItemCenter.x - (pDrawImage.size.width/2), tabBarItemCenter.y - (pDrawImage.size.height/2), pDrawImage.size.width, pDrawImage.size.height); 
       [pDrawImage drawInRect: drawRect]; 
      } 
     } 
    } 
} 

GozTabBarItem.h

#import <UIKit/UIKit.h> 

@interface GozTabBarItem : NSObject 
{ 
} 

@property UIImage* selectedImage; 
@property UIImage* unSelectedImage; 

- (id) initWithSelectedImage: (UIImage*) selectedImage andUnselectedImage: (UIImage*) unSelectedImage; 

@end 

GozTabBarItem.m

#import "GozTabBarItem.h" 

@implementation GozTabBarItem 

@synthesize selectedImage; 
@synthesize unSelectedImage; 

- (id) initWithSelectedImage: (UIImage*) selectedImg andUnselectedImage: (UIImage*) unSelectedImg 
{ 
    self = [super init]; 
    if (self) 
    { 
     self.selectedImage  = selectedImg; 
     self.unSelectedImage = unSelectedImg; 
    } 
    return self; 
} 
@end 

希望有所幫助。