我刚开始使用Xcode 4.3中的主 - 细节视图模板进行播放,并试图更改主控的背景颜色并将其设置为颜色渐变。 这里是我的尝试:iOS UITableView:使用CAGradientLayer将背景颜色设置为渐变
Colors.m
#import "Colors.h"
@implementation Colors
+ (UIColor *) navigationMenuGradientTop
{
return [UIColor colorWithRed:213.0f/255.0f green:91.0f/255.0f blue:92.0f/255.0f alpha:1.0f];
}
+ (UIColor *) navigationMenuGradientBottom
{
return [UIColor colorWithRed:188.0f/255.0f green:0.0f/255.0f blue:1.0f/255.0f alpha:1.0f];
}
+ (CAGradientLayer *) navigationMenuGradient
{
NSArray *colors = [NSArray arrayWithObjects:(id)self.navigationMenuGradientTop, self.navigationMenuGradientBottom, nil];
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.colors = colors;
return gradientLayer;
}
@end
MasterViewController.m
import "Colors.h"
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
CAGradientLayer *bgLayer = [Colors navigationMenuGradient];
bgLayer.frame = tableView.bounds;
[tableView.layer insertSublayer:bgLayer atIndex:0];
return cell;
}
运行后我main
出现以下错误 - Thread 1: EXC_BAD_ACCESS (code=1, address=0xxxxxxxx)
int main(int argc, char *argv[])
{
@autorelasespool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
我也将QuartzCore框架添加到项目中。我在这里错过了什么?当发生这样的错误时,我通常应该采取什么方向(因为构建成功了,应用程序似乎已经崩溃了)?
[上的UIView梯度和UILabels在iPhone上]的可能重复(http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone) – 2013-07-09 19:58:11