我正在開發(fā)一個想要更改UIPageControl分頁點的顏色或圖像的應(yīng)用程序。我該如何更改？是否可以UIpageControl在上述情況下進行自定義？
3 回答
互換的青春
TA貢獻(xiàn)1797條經(jīng)驗 獲得超6個贊
在iOS 6中，您可以設(shè)置的色調(diào)顏色UIPageControl：
有2個新屬性：
pageIndicatorTintColor
currentPageIndicatorTintColor
您還可以使用外觀API更改所有頁面指示器的顏色。
如果您以iOS 5為目標(biāo)，請確保它不會崩潰：
if ([pageControl respondsToSelector:@selector(setPageIndicatorTintColor:)]) {
pageControl.pageIndicatorTintColor = [UIColor whiteColor];
}
慕雪6442864
TA貢獻(xiàn)1812條經(jīng)驗 獲得超5個贊
如果有人想要它的ARC /現(xiàn)代版本（無需將屬性重新定義為ivar，無需取消分配，并且可以與Interface Builder一起使用）：
#import <UIKit/UIKit.h>
@protocol PageControlDelegate;
@interface PageControl : UIView
// Set these to control the PageControl.
@property (nonatomic) NSInteger currentPage;
@property (nonatomic) NSInteger numberOfPages;
// Customize these as well as the backgroundColor property.
@property (nonatomic, strong) UIColor *dotColorCurrentPage;
@property (nonatomic, strong) UIColor *dotColorOtherPage;
// Optional delegate for callbacks when user taps a page dot.
@property (nonatomic, weak) NSObject<PageControlDelegate> *delegate;
@end
@protocol PageControlDelegate<NSObject>
@optional
- (void)pageControlPageDidChange:(PageControl *)pageControl;
@end
PageControl.m：
#import "PageControl.h"
// Tweak these or make them dynamic.
#define kDotDiameter 7.0
#define kDotSpacer 7.0
@implementation PageControl
@synthesize dotColorCurrentPage;
@synthesize dotColorOtherPage;
@synthesize currentPage;
@synthesize numberOfPages;
@synthesize delegate;
- (void)setCurrentPage:(NSInteger)page
{
currentPage = MIN(MAX(0, page), self.numberOfPages-1);
[self setNeedsDisplay];
}
- (void)setNumberOfPages:(NSInteger)pages
{
numberOfPages = MAX(0, pages);
currentPage = MIN(MAX(0, self.currentPage), numberOfPages-1);
[self setNeedsDisplay];
}
- (id)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame])
{
// Default colors.
self.backgroundColor = [UIColor clearColor];
self.dotColorCurrentPage = [UIColor blackColor];
self.dotColorOtherPage = [UIColor lightGrayColor];
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super initWithCoder:aDecoder])
{
self.dotColorCurrentPage = [UIColor blackColor];
self.dotColorOtherPage = [UIColor lightGrayColor];
}
return self;
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(context, true);
CGRect currentBounds = self.bounds;
CGFloat dotsWidth = self.numberOfPages*kDotDiameter + MAX(0, self.numberOfPages-1)*kDotSpacer;
CGFloat x = CGRectGetMidX(currentBounds)-dotsWidth/2;
CGFloat y = CGRectGetMidY(currentBounds)-kDotDiameter/2;
for (int i=0; i<self.numberOfPages; i++)
{
CGRect circleRect = CGRectMake(x, y, kDotDiameter, kDotDiameter);
if (i == self.currentPage)
{
CGContextSetFillColorWithColor(context, self.dotColorCurrentPage.CGColor);
}
else
{
CGContextSetFillColorWithColor(context, self.dotColorOtherPage.CGColor);
}
CGContextFillEllipseInRect(context, circleRect);
x += kDotDiameter + kDotSpacer;
}
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if (!self.delegate) return;
CGPoint touchPoint = [[[event touchesForView:self] anyObject] locationInView:self];
CGFloat dotSpanX = self.numberOfPages*(kDotDiameter + kDotSpacer);
CGFloat dotSpanY = kDotDiameter + kDotSpacer;
CGRect currentBounds = self.bounds;
CGFloat x = touchPoint.x + dotSpanX/2 - CGRectGetMidX(currentBounds);
CGFloat y = touchPoint.y + dotSpanY/2 - CGRectGetMidY(currentBounds);
if ((x<0) || (x>dotSpanX) || (y<0) || (y>dotSpanY)) return;
self.currentPage = floor(x/(kDotDiameter+kDotSpacer));
if ([self.delegate respondsToSelector:@selector(pageControlPageDidChange:)])
{
[self.delegate pageControlPageDidChange:self];
}
}
@end
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