#import "LabelTestViewController.h"
@implementation LabelTestViewController
/*
Accessing the Text Attributes
text property
font property
textColor property
textAlignment property
lineBreakMode property
enabled property
Sizing the Label’s Text
adjustsFontSizeToFitWidth property
baselineAdjustment property
minimumFontSize property 无例
numberOfLines property
Managing Highlight Values
highlightedTextColor property
highlighted property
Drawing a Shadow
shadowColor property
shadowOffset property
Drawing and Positioning Overrides
– textRectForBounds:limitedToNumberOfLines: 无例
– drawTextInRect: 无例
Setting and Getting Attributes
userInteractionEnabled property
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void )viewDidLoad {
UILabel *label1 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 20.0 , 200.0 , 50.0 )];
UILabel *label2 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 80.0 , 200.0 , 50.0 )];
UILabel *label3 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 140.0 , 200.0 , 50.0 )];
UILabel *label4 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 200.0 , 200.0 , 50.0 )];
UILabel *label5 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 260.0 , 200.0 , 50.0 )];
UILabel *label6 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 320.0 , 200.0 , 50.0 )];
UILabel *label7 = [[UILabel alloc ]initWithFrame :CGRectMake (50.0 , 380.0 , 200.0 , 50.0 )];
//设置显示文字
label1.text = @"label1" ;
label2.text = @"label2" ;
label3. text = @"label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--";
label4. text = @"label4--label4--label4--label4--";
label5. text = @"label5--label5--label5--label5--label5--label5--";
label6.text = @"label6" ;
label7.text = @"label7" ;
//设置字体:粗体，正常的是 SystemFontOfSize
label1.font = [UIFont boldSystemFontOfSize :20 ];
//设置文字颜色
label1.textColor = [UIColor orangeColor ];
label2.textColor = [UIColor purpleColor ];
//设置文字位置
label1.textAlignment = UITextAlignmentRight ;
label2. textAlignment = UITextAlignmentCenter;
//设置字体大小适应label宽度
label4. adjustsFontSizeToFitWidth = YES ;
//设置label的行数
UIlabel.backgroudColor=[UIColor clearColor]; //可以去掉背景色
//设置高亮
label6.highlighted = YES ;
label6. highlightedTextColor = [ UIColor orangeColor ];
//设置阴影
label7.shadowColor = [UIColor redColor ];
label7.shadowOffset = CGSizeMake (1.0 ,1.0 );
// 设置是否能与用户进行交互
label7. userInteractionEnabled = YES ;
//设置label中的文字是否可变，默认值是YES
label3.enabled = NO ;
// 设置文字过长时的显示格式
label3. lineBreakMode = UILineBreakModeMiddleTruncation; // 截去中间
// typedef enum {
// UILineBreakModeWordWrap = 0,
// UILineBreakModeCharacterWrap,
// UILineBreakModeClip,//截去多余部分
// UILineBreakModeHeadTruncation,//截去头部
// UILineBreakModeTailTruncation,//截去尾部
// UILineBreakModeMiddleTruncation,//截去中间
// } UILineBreakMode;
//如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为
label4. baselineAdjustment = UIBaselineAdjustmentNone;
// typedef enum {
// UIBaselineAdjustmentAlignBaselines,
// UIBaselineAdjustmentAlignCenters,
// UIBaselineAdjustmentNone,
// } UIBaselineAdjustment;
[self .view addSubview :label1];
[self .view addSubview :label2];
[self .view addSubview :label3];
[self .view addSubview :label4];
[self .view addSubview :label5];
[self .view addSubview :label6];
[self .view addSubview :label7];
[label1 release ];
[label2 release ];
[label3 release ];
[label4 release ];
[label5 release ];
[label6 release ];
[label7 release ];
[super viewDidLoad ];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void )didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[ super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void )viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void )dealloc {
[super dealloc ];
}
@end
添加权限:
<uses-permission android:name="android.permission.SET_WALLPAPER"></uses-permission>
private Button button1;
private Button button2;
private ImageView imageView1;
private ImageView imageView2;
private ImageView imageView3;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wall_paper);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
clearWallpaper();
} catch (IOException e) {
e.printStackTrace();
}
}
});
imageView1 = (ImageView) findViewById(R.id.imageView1);
imageView1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Bitmap bitmap = BitmapFactory.decodeResource(getBaseContext().getResources(), R.drawable.img1);
try {
setWallpaper(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
});
imageView2 = (ImageView) findViewById(R.id.imageView2);
imageView2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Bitmap bitmap = BitmapFactory.decodeResource(getBaseContext().getResources(), R.drawable.img2);
try {
setWallpaper(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
});
button2 = (Button) findViewById(R.id.button2);
imageView3 = (ImageView) findViewById(R.id.imageView3);
button2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
imageView3.setImageDrawable(getWallpaper());
}
});
}
在学习Object-C 过程中碰到需要生成随机数的，并且还要保留小数点后指定位数，往上搜索没有一个统一的答案, 自己尝试过后如下解决
首先从c代码测试来看结果
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main (int argc, const char * argv[])
{
int i;
srand((unsigned int) time(NULL));
for(i=0;i<9;i++){
printf("%.2f\n",(float)(rand()%100001)*0.001f);
}
return 0;
}
这样就生成了我要的100以内的随机数，我还需要一些负数，所以就最后还要减去50
NSNumber* tempnumber = [NSNumber numberWithDouble:[[NSString stringWithFormat:@"%.2f",
(float)(rand()%100001)*0.001f -20] doubleValue]];