如何在iOS中更改UIAlertView对话框的颜色？
我有一个应用程序，我使用UIAlertView显示一条警报消息。 默认情况下，对话框的颜色是蓝色的。 谁能告诉我，如何改变颜色？ 可以改变吗？
像这样使用
[CustomAlert setBackgroundColor:[UIColor blueColor] withStrokeColor:[UIColor greenColor]]; .h和.m文件的内容
CustomAlert.h
#import <UIKit/UIKit.h> @interface CustomAlert : UIAlertView { } + (void) setBackgroundColor:(UIColor *) background withStrokeColor:(UIColor *) stroke; @end
CustomAlert.m
#import "CustomAlert.h" @interface CustomAlert (Private) - (void) drawRoundedRect:(CGRect) rect inContext:(CGContextRef) context withRadius:(CGFloat) radius; @end static UIColor *fillColor = nil; static UIColor *borderColor = nil; @implementation CustomAlert + (void) setBackgroundColor:(UIColor *) background withStrokeColor:(UIColor *) stroke { if(fillColor != nil) { [fillColor release]; [borderColor release]; } fillColor = [background retain]; borderColor = [stroke retain]; } - (id)initWithFrame:(CGRect)frame { if((self = [super initWithFrame:frame])) { if(fillColor == nil) { fillColor = [[UIColor blackColor] retain]; borderColor = [[UIColor colorWithHue:0.625 saturation:0.0 brightness:0.8 alpha:0.8] retain]; } } return self; } - (void)layoutSubviews { for (UIView *sub in [self subviews]) { if([sub class] == [UIImageView class] && sub.tag == 0) { // The alert background UIImageView tag is 0, // if you are adding your own UIImageView's // make sure your tags != 0 or this fix // will remove your UIImageView's as well! [sub removeFromSuperview]; break; } } } - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextClearRect(context, rect); CGContextSetAllowsAntialiasing(context, true); CGContextSetLineWidth(context, 0.0); CGContextSetAlpha(context, 0.8); CGContextSetLineWidth(context, 2.0); CGContextSetStrokeColorWithColor(context, [borderColor CGColor]); CGContextSetFillColorWithColor(context, [fillColor CGColor]); // Draw background CGFloat backOffset = 2; CGRect backRect = CGRectMake(rect.origin.x + backOffset, rect.origin.y + backOffset, rect.size.width - backOffset*2, rect.size.height - backOffset*2); [self drawRoundedRect:backRect inContext:context withRadius:8]; CGContextDrawPath(context, kCGPathFillStroke); // Clip Context CGRect clipRect = CGRectMake(backRect.origin.x + backOffset-1, backRect.origin.y + backOffset-1, backRect.size.width - (backOffset-1)*2, backRect.size.height - (backOffset-1)*2); [self drawRoundedRect:clipRect inContext:context withRadius:8]; CGContextClip (context); //Draw highlight CGGradientRef glossGradient; CGColorSpaceRef rgbColorspace; size_t num_locations = 2; CGFloat locations[2] = { 0.0, 1.0 }; CGFloat components[8] = { 1.0, 1.0, 1.0, 0.35, 1.0, 1.0, 1.0, 0.06 }; rgbColorspace = CGColorSpaceCreateDeviceRGB(); glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations); CGRect ovalRect = CGRectMake(-130, -115, (rect.size.width*2), rect.size.width/2); CGPoint start = CGPointMake(rect.origin.x, rect.origin.y); CGPoint end = CGPointMake(rect.origin.x, rect.size.height/5); CGContextSetAlpha(context, 1.0); CGContextAddEllipseInRect(context, ovalRect); CGContextClip (context); CGContextDrawLinearGradient(context, glossGradient, start, end, 0); CGGradientRelease(glossGradient); CGColorSpaceRelease(rgbColorspace); } - (void) drawRoundedRect:(CGRect) rrect inContext:(CGContextRef) context withRadius:(CGFloat) radius { CGContextBeginPath (context); CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect); CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect); CGContextMoveToPoint(context, minx, midy); CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); CGContextClosePath(context); } - (void)dealloc { [super dealloc]; } @end
从UIAlertView类参考 ：
UIAlertView类旨在按原样使用，不支持子类。 这个类的视图层次是私有的，不能被修改。
你必须实现你的UIAlertView 。 您不能更改默认的蓝色。
使用uiview来显示警报，而不是使用UIAlertView，然后相应地更改该视图的颜色