[英]Background image not displayed on UIView
我有一個實現“UIView”的 class 和內部- (void)drawRect:(CGRect)rect
方法我添加了一些自定義按鈕。 在 UIViewController 中,我聲明了該視圖的一個實例並將其添加到 self.view。
如果我在- (void)viewDidLoad
中執行此操作,則一切正常,但如果我創建一個在按下按鈕時調用的方法,並將該視圖添加到 self.view,則按鈕背景會在幾秒鍾后顯示。 到那時,只有按鈕的名稱以白色顯示。
我做錯了什么? 問候
@implementation CustomButton
@synthesize isPressed, buttonViewNumber;
- (id)initWithFrame:(CGRect)frame
title:(NSString *)title
tag:(int)tag
{
self = [super initWithFrame:frame];
if (self) {
[self setTitle:title forState:UIControlStateNormal];
[self setTag:tag];
self.titleLabel.font = [UIFont fontWithName:@"Helvetica" size:14];
self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
self.contentEdgeInsets = UIEdgeInsetsMake(0, 5, 0, 0);
[self setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[self setBackgroundImage:[[UIImage imageNamed:@"btn_white_add.png"] stretchableImageWithLeftCapWidth:20.0 topCapHeight:0.0] forState:UIControlStateNormal];
[self addTarget:self action:@selector(didSelect) forControlEvents:UIControlEventTouchUpInside];
self.isPressed = NO;
}
return self;
}
@implementation ButtonsView
@synthesize listOfButtons;
- (id)initWithFrame:(CGRect)frame bundle:(NSArray *)data
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor clearColor];
listOfNames = [[NSArray arrayWithArray:data] retain];
listOfButtons = [[NSMutableArray alloc] init];
currentViewNumber = 0;
viewNumber = 0;
}
return self;
}
- (void)drawRect:(CGRect)rect
{
CGSize maximumLabelSize = CGSizeMake(300,24);
UIFont *buttonFont = [UIFont fontWithName:@"Helvetica" size:14.0];
float lineSize = 0;
float lineNumber = 0;
NSArray *listOfFrameX = [NSArray arrayWithObjects:
[NSString stringWithFormat:@"%d",FIRST_LINE_Y],
[NSString stringWithFormat:@"%d",SECOND_LINE_Y],
[NSString stringWithFormat:@"%d",THIRD_LINE_Y],
nil];
for (int i = 0; i < [listOfNames count]; i++) {
CGSize expectedLabelSize = [[[listOfNames objectAtIndex:i] objectForKey:@"name"] sizeWithFont:buttonFont
constrainedToSize:maximumLabelSize
lineBreakMode:UILineBreakModeTailTruncation];
if ((lineSize + expectedLabelSize.width) > 260) {
lineNumber++;
lineSize = 0;
}
if (lineNumber > 2) {
viewNumber ++;
lineSize = 0;
lineNumber = 0;
}
CGRect newFrame = CGRectMake(lineSize,
[[listOfFrameX objectAtIndex:lineNumber] floatValue],
expectedLabelSize.width+30,
24);
CustomButton *myButton = [[CustomButton alloc] initWithFrame:newFrame
title:[[listOfNames objectAtIndex:i] objectForKey:@"name"]
tag:[[[listOfNames objectAtIndex:i] objectForKey:@"id"] intValue]];
myButton.buttonViewNumber = viewNumber;
[listOfButtons addObject:myButton];
if (viewNumber == 0) {
[self addSubview:myButton];
}
lineSize += expectedLabelSize.width + 40;
[myButton release];
}
}
這樣它的工作原理:
- (void)viewDidLoad
{
[super viewDidLoad];
placeholders = [[NSArray arrayWithObjects:
something,something, something,something,nil] retain];
CGRect frame = CGRectMake(10, 247, 300, 84);
buttonsView = [[ButtonsView alloc] initWithFrame:frame bundle:placeholders];
[self.view addSubview:buttonsView];
像這樣是行不通的:
- (void)getCompanyNames:(id)result
{
NSArray *listOfCompanies = (NSArray *)result;
CGRect frame = CGRectMake(10, 247, 300, 84);
buttonsView = [[ButtonsView alloc] initWithFrame:frame bundle:listOfCompanies];
[self.view addSubview:buttonsView];
}
我需要在 -viewDidLoad 之后將“buttonsView”object 添加到 self.view
drawRect:不完全是您應該為您的視圖創建子視圖(按鈕是子視圖)的地方。 這應該將 go 轉換為initWithFrame:或awakeFromNib ,具體取決於您的視圖創建方法:以編程方式或使用 nib。
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