我最近一直在做一个 mien 的小项目，并尝试使用我在 GitHub 上找到的这个 TableView： https ://github.com/nicolasgomollon/NGDynamicGradientCell
不幸的是，我无法使它像您在此 Git 上看到的那样工作： https ://github.com/aout/TestForCells
我使用它的方式似乎有些严重错误，尤其是图像。没有图像一切正常，但是当我添加它们时，我无法创建任何单元格。
这是一些代码：
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
[self setSelectionStyle:UITableViewCellSelectionStyleNone];
[self setBackgroundColor:[UIColor whiteColor]];
maskFill = [UIImage imageNamed:@"mask-fill.png"];
maskFill = [maskFill resizableImageWithCapInsets:UIEdgeInsetsMake(1.0f, 1.0f, 1.0f, 1.0f)];
bubbleImage = [UIImage imageNamed:@"bubble-min.png"];
bubbleMaskImage = [UIImage imageNamed:@"mask-bubble-min.png"];
bubbleEdgeInsetsSent = UIEdgeInsetsMake(17.0f, 20.0f, 17.0f, 26.0f);
bubbleEdgeInsetsReceived = UIEdgeInsetsMake(17.0f, 26.0f, 17.0f, 20.0f);
bubbleMaskImage = [bubbleMaskImage resizableImageWithCapInsets:bubbleEdgeInsetsSent];
grayView = [[UIImageView alloc] initWithFrame:CGRectZero];
[grayView setBackgroundColor:[UIColor clearColor]];
[grayView setTintColor:RGBA(229.0f, 229.0f, 234.0f, 1.0f)];
[grayView setAlpha:0.0f];
[self.contentView addSubview:grayView];
messageLabel = [[UILabel alloc] initWithFrame:CGRectZero];
[messageLabel setBackgroundColor:[UIColor clearColor]];
[messageLabel setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleBody]];
[messageLabel setLineBreakMode:NSLineBreakByWordWrapping];
[messageLabel setNumberOfLines:0];
[self.contentView addSubview:messageLabel];
}
return self;
}
+ (CGFloat)heightForMessage:(NSString *)message
{
UIFont *messageFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
CGSize messageConstraints = CGSizeMake(190.0f, MAXFLOAT);
CGSize messageSize = [message boundingRectWithSize:messageConstraints options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : messageFont
}
context:nil].size;
CGFloat messageHeight = MAX(35.0f, 10.0f + roundf(messageSize.height) + 5.0f);
return messageHeight + kMessagePadding;
}
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
UIGraphicsBeginImageContextWithOptions(newSize, NO, image.scale);
[image drawInRect:CGRectSetSize(CGRectZero, newSize)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
[messageLabel setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleBody]];
[messageLabel setTextColor:self.sent?[UIColor whiteColor]:[UIColor blackColor]];
CGSize messageConstraints = CGSizeMake(190.0f, MAXFLOAT);
CGSize messageSize = [messageLabel.text boundingRectWithSize:messageConstraints options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : messageLabel.font} context:nil].size;
CGFloat originX = 18.0f + kBubbleEdgeInset;
if (self.sent)
originX = self.bounds.size.width - messageSize.width - originX;
[messageLabel setFrame:CGRectMake(originX, 7.0f, messageSize.width, messageSize.height)];
CGFloat messageWidth = MAX(48.0f, 13.0f + roundf(messageSize.width) + 18.0f);
CGFloat messageHeight = MAX(35.0f, 10.0f + roundf(messageSize.height) + 5.0f);
if (self.sent) {
UIImage *maskImage = [self imageWithImage:bubbleMaskImage scaledToSize:CGSizeMake(messageWidth, messageHeight)];
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0f);
// Draw the bubble mask image.
[maskImage drawInRect:CGRectMake(self.bounds.size.width - messageWidth - kBubbleEdgeInset, 0.0f, messageWidth, messageHeight)];
// Draw the message label text (since it'll be masked out).
[messageLabel.text drawInRect:messageLabel.frame
withAttributes:@{NSFontAttributeName : messageLabel.font,
NSForegroundColorAttributeName : messageLabel.textColor}];
// Draw the mask fill image to the left of the bubble mask image.
[maskFill drawInRect:CGRectMake(0.0f, 0.0f, self.bounds.size.width - messageWidth - kBubbleEdgeInset, self.bounds.size.height)];
// Draw the mask fill image to the right of the bubble mask image.
[maskFill drawInRect:CGRectMake(self.bounds.size.width - kBubbleEdgeInset, 0.0f, kBubbleEdgeInset, self.bounds.size.height)];
// Draw the mask fill image in the remaining space below the bubble mask image.
[maskFill drawInRect:CGRectMake(0.0f, messageHeight, self.bounds.size.width, self.bounds.size.height - messageHeight)];
// Get everything we drew as an image that we can use to mask the cell with.
UIImage *imageMask = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CALayer *maskLayer = [CALayer layer];
[maskLayer setContents:(id)imageMask.CGImage];
[maskLayer setFrame:self.bounds];
[self.layer setMask:maskLayer];
} else {
[grayView setFrame:CGRectMake(kBubbleEdgeInset, 0.0f, messageWidth, messageHeight)];
UIImage *maskImage = bubbleImage;
maskImage = [UIImage imageWithCGImage:maskImage.CGImage scale:maskImage.scale orientation:UIImageOrientationUpMirrored];
maskImage = [maskImage resizableImageWithCapInsets:bubbleEdgeInsetsReceived];
maskImage = [self imageWithImage:maskImage scaledToSize:CGSizeMake(messageWidth, messageHeight)];
maskImage = [maskImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[grayView setImage:maskImage];
}
[messageLabel setAlpha:!self.sent];
[grayView setAlpha:!self.sent];
}
- (UILabel *)textLabel {
return messageLabel;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end
有什么帮助吗？谢谢！