awakefromnib有一个字符串s，查找字符串s是否在字符串中t，如果有返回重复的个数,C语言或者Objective-C变成

如何在UITextView中添加默认文字

在UITextField中自带placeholder属性，可以用于提示输入框信息。

但是UITextView并不具备此功能 介绍两种方法来实现： 第一种： 初始化UITextView //首先定义UITextView UITextView *textView = [[UITextView alloc] init]; textView.font = [UIFont systemFontOfSize:14]; textView.frame =CGRectMake(10, 0, cell.contentView.bounds.size.width-20, side); textView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; textView.backgroundColor = [UIColor whiteColor]; [cell.contentView addSubview:textView]; textView.hidden = NO; textView.delegate = self; //其次在UITextView上面覆盖个UILable,UILable设置为全局变量。

uilabel.frame =CGRectMake(17, 8, cell.contentView.bounds.size.width - side+10, 20); uilabel.text = @"请填写审批意见..."; uilabel.enabled = NO;//lable必须设置为不可用 uilabel.backgroundColor = [UIColor clearColor]; [cell.contentView addSubview:uilabel]; 实现UITextView的代理 -(void)textViewDidChange:(UITextView *)textView { self.examineText = textView.text; if (textView.text.length == 0) { uilabel.text = @"请填写审批意见..."; }else{ uilabel.text = @""; } } 第二种： UITextView 实现 placeholder 及隐藏键盘 #import @interface UIPlaceHolderTextView : UITextView { NSString *placeholder; UIColor *placeholderColor; @private UILabel *placeHolderLabel; } @property(nonatomic, retain) UILabel *placeHolderLabel; @property(nonatomic, retain) NSString *placeholder; @property(nonatomic, retain) UIColor *placeholderColor; -(void)textChanged:(NSNotification*)notification; @end #import "UIPlaceHolderTextView.h" @implementation UIPlaceHolderTextView @synthesize placeHolderLabel; @synthesize placeholder; @synthesize placeholderColor; - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [placeHolderLabel release]; placeHolderLabel = nil; [placeholderColor release]; placeholderColor = nil; [placeholder release]; placeholder = nil; [super dealloc]; } - (void)awakeFromNib { [super awakeFromNib]; [self setPlaceholder:@""]; [self setPlaceholderColor:[UIColor lightGrayColor]]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChanged:) name:UITextViewTextDidChangeNotification object:nil]; } - (id)initWithFrame:(CGRect)frame { if( (self = [super initWithFrame:frame]) ) { [self setPlaceholder:@""]; [self setPlaceholderColor:[UIColor lightGrayColor]]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChanged:) name:UITextViewTextDidChangeNotification object:nil]; } return self; } - (void)textChanged:(NSNotification *)notification { if([[self placeholder] length] == 0) { return; } if([[self text] length] == 0) { [[self viewWithTag:999] setAlpha:1]; } else { [[self viewWithTag:999] setAlpha:0]; } } - (void)setText:(NSString *)text { [super setText:text]; [self textChanged:nil]; } - (void)drawRect:(CGRect)rect { if( [[self placeholder] length] > 0 ) { if ( placeHolderLabel == nil ) { placeHolderLabel = [[UILabel alloc] initWithFrame:CGRectMake(8,8,self.bounds.size.width - 16,0)]; placeHolderLabel.lineBreakMode = UILineBreakModeWordWrap; placeHolderLabel.numberOfLines = 0; placeHolderLabel.font = self.font; placeHolderLabel.backgroundColor = [UIColor clearColor]; placeHolderLabel.textColor = self.placeholderColor; placeHolderLabel.alpha = 0; placeHolderLabel.tag = 999; [self addSubview:placeHolderLabel]; } placeHolderLabel.text = self.placeholder; [placeHolderLabel sizeToFit]; [self sendSubviewToBack:placeHolderLabel]; } if( [[self text] length] == 0 && [[self placeholder] length] > 0 ) { [[self viewWithTag:999] setAlpha:1]; } [super drawRect:rect]; } @end //隐藏键盘，实现UITextViewDelegate -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text { if ([text isEqualToString:@" "]) { [m_textView resignFirstResponder]; return NO; } return YES; }

storyboard中定义的view的坐标和大小，用代码改变大小时，是不是改变不了

1. 建一个 UIView的子类(MyView.h/MyView.m) 2. 建一个 View类型的XIB 3. 把xib的file‘s owner设为MyView 4. 在.h文件里加上 @property (nonatomic, retain) IBOutlet UIView *contentView; 　　5.绑定xib里的根view到.h里的 contentView 6.在.m里加上 　　- (void)awakeFromNib { NSLog(@"awake from nib"); [[NSBundle mainBundle] loadNibNamed:@"MyView" owner:self options:nil]; [self addSubview:self.contentView]; } 　　ok了。

storyboard里用的时候把UIView的类名改为MyView就可以。

xib和.h可以互相绑定子outlet什么的。

关于控制view的UIView.m类的请教

如果你是用initwithframe创建的view，你就自己写个initwithframe。

- (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { // Initialization code } return self;}如果你是用interface builder拽的view，用下面的肯定可以-(void)awakeFromNib{}

有一个字符串s，查找字符串s是否在字符串中t，如果有返回重复的个数,C语言或者Objective-C变成

返回值如果为0 说明没找到 #import "find.h" @implementation find - (void)awakeFromNib { NSString *str1 = @"tststststssststststst"; NSString *str2 = @"s"; int iCount = [self findTheString:str2 FromString:str1]; NSLog(@"%d",iCount); } - (int)findTheString:(NSString *)str1 FromString:(NSString *)str2 { NSArray *array = [ponentsSeparatedByString:str1]; return [array count] - 1; } @end