如何设置 UIImageView 控制器目标 c 的背景图像？
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【中文标题】如何设置 UIImageView 控制器目标 c 的背景图像？【英文标题】：How to set a background image of a UIImageView controller objective c? 【发布时间】：2016-12-07 18:05:12 【问题描述】：我的 comsci 班级正在开发一个应用程序，该应用程序将根据日期和楼层显示我们学校的地图。我们无法让从 SecondTableViewController 到 MapViewController 的 segue 工作，因为我们认为背景图像（地图）没有正确设置。
SecondViewController.h
#import <UIKit/UIKit.h>
@interface SecondTableViewController : UITableViewController
@property(nonatomic, strong) NSString *daysName;
@property(nonatomic, strong) NSString *floorName;
@end
SecondViewController.m
#import "SecondTableViewController.h"
#import "MapViewController.h"
@interface SecondTableViewController ()
@end
@implementation SecondTableViewController
NSArray *ADay;
NSArray *BDay;
NSArray *CDay;
NSArray *DDay;
NSArray *EDay;
NSArray *FDay;
NSArray *GDay;
NSArray *HDay;
/*-(void)configureWithImage:(UIImage *)paramImage
self.capturedImage = paramImage;
*/
-(id)initWithStyle:(UITableViewStyle)style
self = [super initWithStyle:style];
if (self)
//custom initalization
return self;
- (void)viewDidLoad
[super viewDidLoad];
ADay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
BDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
CDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
DDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
EDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
FDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
GDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
HDay = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
//self.backImageView.image = self.capturedImage;
- (void)didReceiveMemoryWarning
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
return 1;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
if ([_daysName isEqualToString:@"ADay"])
return [ADay count];
else if ([_daysName isEqualToString:@"BDay"])
return [BDay count];
else if ([_daysName isEqualToString:@"CDay"])
return [CDay count];
else if ([_daysName isEqualToString:@"DDay"])
return [DDay count];
else if ([_daysName isEqualToString:@"EDay"])
return [EDay count];
else if ([_daysName isEqualToString:@"FDay"])
return [FDay count];
else if ([_daysName isEqualToString:@"GDay"])
return [GDay count];
else if ([_daysName isEqualToString:@"HDay"])
return [HDay count];
return 0;
- (UIImage *)cellBackgroundForRowAtIndexPath:(NSIndexPath *)indexPath //:(NSString *)floorName
// NSInteger rowCount = [self tableView:[self tableView] numberOfRowsInSection:0];
NSInteger rowIndex = indexPath.row;
UIImage *background = nil;
return background;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
static NSString *simpleTableIdentifier = @"Floors2Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
if ([_daysName isEqualToString:@"ADay"])
cell.textLabel.text = [ADay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"BDay"])
cell.textLabel.text = [BDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"CDay"])
cell.textLabel.text = [CDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"DDay"])
cell.textLabel.text = [DDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"EDay"])
cell.textLabel.text = [EDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"FDay"])
cell.textLabel.text = [FDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"GDay"])
cell.textLabel.text = [GDay objectAtIndex:indexPath.row];
else if ([_daysName isEqualToString:@"HDay"])
cell.textLabel.text = [HDay objectAtIndex:indexPath.row];
// Assign our own background image for the cell
UIImage *background = [self cellBackgroundForRowAtIndexPath:indexPath];
UIImageView *cellBackgroundView = [[UIImageView alloc] initWithImage:background];
cellBackgroundView.image = background;
cell.backgroundView = cellBackgroundView;
return cell;
#pragma mark - Navigation
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
if([[segue identifier] isEqualToString:@"showFloorDetail"])
NSArray *array = [NSArray arrayWithObjects: @"1stFloor",@"2ndFloor", @"3rdFloor", nil];
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
MapViewController *destViewController = segue.destinationViewController;
UIImage *Background;
if ([_daysName isEqual:@"ADay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"A2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"A3 copy.png"];
//background = [UIImage imageNamed:@"1stFloor"];
else if ([_daysName isEqual:@"BDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"B2 copy.png"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"B3 copy.JPEG"];
else if ([_daysName isEqual:@"CDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"C2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"C3 copy.JPEG"];
else if ([_daysName isEqual:@"DDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"D2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"D3 copy.JPEG"];
else if ([_daysName isEqual:@"EDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"E2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"E3 copy.JPEG"];
else if ([_daysName isEqual:@"FDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"F2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"F3 copy.JPEG"];
else if ([_daysName isEqual:@"GDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"G2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"G3 copy.JPEG"];
else
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"H2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"H3 copy.JPEG"];
[destViewController configureWithImage:Background];
destViewController.floorName = [array objectAtIndex:indexPath.row];
self.floorName = [array objectAtIndex:indexPath.row];
destViewController.title = destViewController.floorName;
@end
然后引出MapViewController，这是一个UIImageView
MapViewController.h
#import <UIKit/UIKit.h>
//#import "SecondTableViewController.m"
@interface MapViewController : UIViewController
@property(nonatomic, strong)NSString *floorName;
@property(nonatomic, strong)NSString *daysName;
@property (nonatomic, strong) UIImage *background;
@end
MapViewController.m
#import "MapViewController.h"
#import "SecondTableViewController.h"
@interface MapViewController ()
-(void)configureWithImage:(UIImage *)paramImage;
@end
@implementation MapViewController
- (void)viewDidLoad
[super viewDidLoad];
// Do any additional setup after loading the view.
self.daysName = _daysName;
// Assign our own background image for the cell
UIImage *Background;
if ([_daysName isEqual:@"ADay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"A2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"A3 copy.png"];
//background = [UIImage imageNamed:@"1stFloor"];
else if ([_daysName isEqual:@"BDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"B2 copy.png"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"B3 copy.JPEG"];
else if ([_daysName isEqual:@"CDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"C2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"C3 copy.JPEG"];
else if ([_daysName isEqual:@"DDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"D2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"D3 copy.JPEG"];
else if ([_daysName isEqual:@"EDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"E2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"E3 copy.JPEG"];
else if ([_daysName isEqual:@"FDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"F2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"F3 copy.JPEG"];
else if ([_daysName isEqual:@"GDay" ])
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"G2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"G3 copy.JPEG"];
else
if ([_floorName isEqual: @"2ndFloor"])
Background = [UIImage imageNamed:@"H2 copy.JPEG"];
if ([_floorName isEqual: @"3rdFloor"])
Background = [UIImage imageNamed:@"H3 copy.JPEG"];
- (void)didReceiveMemoryWarning
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
@end
我们不知道为什么segue不起作用，为什么我们不知道如何设置MapViewController的背景。
提前感谢您的帮助！！
【问题讨论】：
“不起作用”这个短语没有传达任何信息。解释一下。 所有这些代码，没有实现 Map VC 上唯一重要的方法：configureWithImage:
UIImageView 控制器？
【参考方案1】：
您需要将方法声明移至“MapViewController.h”，以便可以从第一个 viewController 访问它。 ：
//MapViewController.h
@interface MapViewController : UIViewController
-(void)configureWithImage:(UIImage *)paramImage;
@end
其次，您应该在原始视图控制器中调用 segue：
[self performSegueWithIdentifier:@"showFloorDetail" sender:self];
另外，如 cmets 中所述，在 MapViewController.m 中没有实现您的 configureWithImage 方法
-(void)configureWithImage:(UIImage *)paramImage
// Process your image here
[yourImageView setImage:paramImage];
更多 cmets：MapViewController 不是 UIImageView。它在代码中的设置方式是 UIViewController 的子类化。此外，请以小写字母开头命名变量（根据 Apple 约定）。只有类的首字母大写。
【讨论】：
感谢您的建议，但您所说的一切我都做了。如果您对为什么它不起作用有任何其他想法，那将非常有帮助！它在 xcode 中。 你能告诉我们更多关于它为什么不起作用的信息吗？错误信息？ NSlog 输出？以上是关于如何设置 UIImageView 控制器目标 c 的背景图像？的主要内容，如果未能解决你的问题，请参考以下文章
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